PHPMailer / PHPMailer

src/PHPMailer.php

<?php
/**
 * PHPMailer - PHP email creation and transport class.
 * PHP Version 5.5
 *
 * @package   PHPMailer
 * @see       https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project
 * @author    Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
 * @author    Jim Jagielski (jimjag) <jimjag@gmail.com>
 * @author    Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
 * @author    Brent R. Matzelle (original founder)
 * @copyright 2012 - 2016 Marcus Bointon
 * @copyright 2010 - 2012 Jim Jagielski
 * @copyright 2004 - 2009 Andy Prevost
 * @license   http://www.gnu.org/copyleft/lesser.html GNU Lesser General Public License
 * @note      This program is distributed in the hope that it will be useful - WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.
 */

namespace PHPMailer\PHPMailer;

/**
 * PHPMailer - PHP email creation and transport class.
 *
 * @package PHPMailer
 * @author  Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>
 * @author  Jim Jagielski (jimjag) <jimjag@gmail.com>
 * @author  Andy Prevost (codeworxtech) <codeworxtech@users.sourceforge.net>
 * @author  Brent R. Matzelle (original founder)
 */
class PHPMailer

This class has 73 fields which exceeds the configured maximum of 15.

This class has 134 public methods and attributes which exceeds the configured maximum of 45.

This class has a complexity of 535 which exceeds the configured maximum of 50.

This class has 4218 lines of code which exceeds the configured maximum of 1000.

{
    /**
     * Email priority.
     * Options: null (default), 1 = High, 3 = Normal, 5 = low.
     * When null, the header is not set at all.
     *
     * @var integer
     */
    public $Priority = null;

    /**
     * The character set of the message.
     *
     * @var string
     */
    public $CharSet = 'iso-8859-1';

    /**
     * The MIME Content-type of the message.
     *
     * @var string
     */
    public $ContentType = 'text/plain';

    /**
     * The message encoding.
     * Options: "8bit", "7bit", "binary", "base64", and "quoted-printable".
     *
     * @var string
     */
    public $Encoding = '8bit';

    /**
     * Holds the most recent mailer error message.
     *
     * @var string
     */
    public $ErrorInfo = '';

    /**
     * The From email address for the message.
     *
     * @var string
     */
    public $From = 'root@localhost';

    /**
     * The From name of the message.
     *
     * @var string
     */
    public $FromName = 'Root User';

    /**
     * The envelope sender of the message.
     * This will usually be turned into a Return-Path header by the receiver,
     * and is the address that bounces will be sent to.
     * If not empty, will be passed via `-f` to sendmail or as the 'MAIL FROM' value over SMTP.
     *
     * @var string
     */
    public $Sender = '';

    /**
     * The Subject of the message.
     *
     * @var string
     */
    public $Subject = '';

    /**
     * An HTML or plain text message body.
     * If HTML then call isHTML(true).
     *
     * @var string
     */
    public $Body = '';

    /**
     * The plain-text message body.
     * This body can be read by mail clients that do not have HTML email
     * capability such as mutt & Eudora.
     * Clients that can read HTML will view the normal Body.
     *
     * @var string
     */
    public $AltBody = '';

    /**
     * An iCal message part body.
     * Only supported in simple alt or alt_inline message types
     * To generate iCal event structures, use classes like EasyPeasyICS or iCalcreator
     *
     * @see http://sprain.ch/blog/downloads/php-class-easypeasyics-create-ical-files-with-php/
     * @see http://kigkonsult.se/iCalcreator/
     * @var string
     */
    public $Ical = '';

    /**
     * The complete compiled MIME message body.
     *
     * @var string
     */
    protected $MIMEBody = '';

    /**
     * The complete compiled MIME message headers.
     *
     * @var string
     */
    protected $MIMEHeader = '';

    /**
     * Extra headers that createHeader() doesn't fold in.
     *
     * @var string
     */
    protected $mailHeader = '';

    /**
     * Word-wrap the message body to this number of chars.
     * Set to 0 to not wrap. A useful value here is 78, for RFC2822 section 2.1.1 compliance.
     * @see static::STD_LINE_LENGTH
     *
     * @var integer
     */
    public $WordWrap = 0;

    /**
     * Which method to use to send mail.
     * Options: "mail", "sendmail", or "smtp".
     *
     * @var string
     */
    public $Mailer = 'mail';

    /**
     * The path to the sendmail program.
     *
     * @var string
     */
    public $Sendmail = '/usr/sbin/sendmail';

    /**
     * Whether mail() uses a fully sendmail-compatible MTA.
     * One which supports sendmail's "-oi -f" options.
     *
     * @var boolean
     */
    public $UseSendmailOptions = true;

    /**
     * The email address that a reading confirmation should be sent to, also known as read receipt.
     *
     * @var string
     */
    public $ConfirmReadingTo = '';

    /**
     * The hostname to use in the Message-ID header and as default HELO string.
     * If empty, PHPMailer attempts to find one with, in order,
     * $_SERVER['SERVER_NAME'], gethostname(), php_uname('n'), or the value
     * 'localhost.localdomain'.
     *
     * @var string
     */
    public $Hostname = '';

    /**
     * An ID to be used in the Message-ID header.
     * If empty, a unique id will be generated.
     * You can set your own, but it must be in the format "<id@domain>",
     * as defined in RFC5322 section 3.6.4 or it will be ignored.
     * @see https://tools.ietf.org/html/rfc5322#section-3.6.4
     *
     * @var string
     */
    public $MessageID = '';

    /**
     * The message Date to be used in the Date header.
     * If empty, the current date will be added.
     *
     * @var string
     */
    public $MessageDate = '';

    /**
     * SMTP hosts.
     * Either a single hostname or multiple semicolon-delimited hostnames.
     * You can also specify a different port
     * for each host by using this format: [hostname:port]
     * (e.g. "smtp1.example.com:25;smtp2.example.com").
     * You can also specify encryption type, for example:
     * (e.g. "tls://smtp1.example.com:587;ssl://smtp2.example.com:465").
     * Hosts will be tried in order.
     *
     * @var string
     */
    public $Host = 'localhost';

    /**
     * The default SMTP server port.
     *
     * @var integer
     */
    public $Port = 25;

    /**
     * The SMTP HELO of the message.
     * Default is $Hostname. If $Hostname is empty, PHPMailer attempts to find
     * one with the same method described above for $Hostname.
     *
     * @var string
     * @see PHPMailer::$Hostname
     */
    public $Helo = '';

    /**
     * What kind of encryption to use on the SMTP connection.
     * Options: '', 'ssl' or 'tls'
     *
     * @var string
     */
    public $SMTPSecure = '';

    /**
     * Whether to enable TLS encryption automatically if a server supports it,
     * even if `SMTPSecure` is not set to 'tls'.
     * Be aware that in PHP >= 5.6 this requires that the server's certificates are valid.
     *
     * @var boolean
     */
    public $SMTPAutoTLS = true;

    /**
     * Whether to use SMTP authentication.
     * Uses the Username and Password properties.
     *
     * @var boolean
     * @see PHPMailer::$Username
     * @see PHPMailer::$Password
     */
    public $SMTPAuth = false;

    /**
     * Options array passed to stream_context_create when connecting via SMTP.
     *
     * @var array
     */
    public $SMTPOptions = [];

    /**
     * SMTP username.
     *
     * @var string
     */
    public $Username = '';

    /**
     * SMTP password.
     *
     * @var string
     */
    public $Password = '';

    /**
     * SMTP auth type.
     * Options are CRAM-MD5, LOGIN, PLAIN, XOAUTH2, attempted in that order if not specified
     *
     * @var string
     */
    public $AuthType = '';

    /**
     * An instance of the PHPMailer OAuth class.
     *
     * @var OAuth
     */
    protected $oauth = null;

    /**
     * The SMTP server timeout in seconds.
     * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2
     *
     * @var integer
     */
    public $Timeout = 300;

    /**
     * SMTP class debug output mode.
     * Debug output level.
     * Options:
     * * `0` No output
     * * `1` Commands
     * * `2` Data and commands
     * * `3` As 2 plus connection status
     * * `4` Low-level data output
     *
     * @var integer
     * @see SMTP::$do_debug
     */
    public $SMTPDebug = 0;

    /**
     * How to handle debug output.
     * Options:
     * * `echo` Output plain-text as-is, appropriate for CLI
     * * `html` Output escaped, line breaks converted to `<br>`, appropriate for browser output
     * * `error_log` Output to error log as configured in php.ini
     * By default PHPMailer will use `echo` if run from a `cli` or `cli-server` SAPI, `html` otherwise.
     * Alternatively, you can provide a callable expecting two params: a message string and the debug level:
     * <code>
     * $mail->Debugoutput = function($str, $level) {echo "debug level $level; message: $str";};
     * </code>
     * Alternatively, you can pass in an instance of a PSR-3 compatible logger, though only `debug`
     * level output is used:
     * <code>
     * $mail->Debugoutput = new myPsr3Logger;
     * </code>
     * @var string|callable|\Psr\Log\LoggerInterface
     * @see SMTP::$Debugoutput
     */
    public $Debugoutput = 'echo';

    /**
     * Whether to keep SMTP connection open after each message.
     * If this is set to true then to close the connection
     * requires an explicit call to smtpClose().
     *
     * @var boolean
     */
    public $SMTPKeepAlive = false;

    /**
     * Whether to split multiple to addresses into multiple messages
     * or send them all in one message.
     * Only supported in `mail` and `sendmail` transports, not in SMTP.
     *
     * @var boolean
     */
    public $SingleTo = false;

    /**
     * Storage for addresses when SingleTo is enabled.
     *
     * @var array
     */
    protected $SingleToArray = [];

    /**
     * Whether to generate VERP addresses on send.
     * Only applicable when sending via SMTP.
     *
     * @see https://en.wikipedia.org/wiki/Variable_envelope_return_path
     * @see http://www.postfix.org/VERP_README.html Postfix VERP info
     * @var boolean
     */
    public $do_verp = false;

    /**
     * Whether to allow sending messages with an empty body.
     *
     * @var boolean
     */
    public $AllowEmpty = false;

    /**
     * DKIM selector.
     *
     * @var string
     */
    public $DKIM_selector = '';

    /**
     * DKIM Identity.
     * Usually the email address used as the source of the email.
     *
     * @var string
     */
    public $DKIM_identity = '';

    /**
     * DKIM passphrase.
     * Used if your key is encrypted.
     *
     * @var string
     */
    public $DKIM_passphrase = '';

    /**
     * DKIM signing domain name.
     *
     * @example 'example.com'
     * @var     string
     */
    public $DKIM_domain = '';

    /**
     * DKIM private key file path.
     *
     * @var string
     */
    public $DKIM_private = '';

    /**
     * DKIM private key string.
     *
     * If set, takes precedence over `$DKIM_private`.
     * @var string
     */
    public $DKIM_private_string = '';

    /**
     * Callback Action function name.
     *
     * The function that handles the result of the send email action.
     * It is called out by send() for each email sent.
     *
     * Value can be any php callable: http://www.php.net/is_callable
     *
     * Parameters:
     *   boolean $result        result of the send action
     *   array   $to            email addresses of the recipients
     *   array   $cc            cc email addresses
     *   array   $bcc           bcc email addresses
     *   string  $subject       the subject
     *   string  $body          the email body
     *   string  $from          email address of sender
     *
     * @var string
     */
    public $action_function = '';

    /**
     * What to put in the X-Mailer header.
     * Options: An empty string for PHPMailer default, whitespace for none, or a string to use
     *
     * @var string
     */
    public $XMailer = '';

    /**
     * Which validator to use by default when validating email addresses.
     * May be a callable to inject your own validator, but there are several built-in validators.
     * The default validator uses PHP's FILTER_VALIDATE_EMAIL filter_var option.
     *
     * @see PHPMailer::validateAddress()
     * @var string|callable
     */
    public static $validator = 'php';

    /**
     * An instance of the SMTP sender class.
     *
     * @var SMTP
     */
    protected $smtp = null;

    /**
     * The array of 'to' names and addresses.
     *
     * @var array
     */
    protected $to = [];

    /**
     * The array of 'cc' names and addresses.
     *
     * @var array
     */
    protected $cc = [];

    /**
     * The array of 'bcc' names and addresses.
     *
     * @var array
     */
    protected $bcc = [];

    /**
     * The array of reply-to names and addresses.
     *
     * @var array
     */
    protected $ReplyTo = [];

    /**
     * An array of all kinds of addresses.
     * Includes all of $to, $cc, $bcc
     *
     * @var array
     * @see PHPMailer::$to @see PHPMailer::$cc @see PHPMailer::$bcc
     */
    protected $all_recipients = [];

    /**
     * An array of names and addresses queued for validation.
     * In send(), valid and non duplicate entries are moved to $all_recipients
     * and one of $to, $cc, or $bcc.
     * This array is used only for addresses with IDN.
     *
     * @var array
     * @see PHPMailer::$to @see PHPMailer::$cc @see PHPMailer::$bcc
     * @see PHPMailer::$all_recipients
     */
    protected $RecipientsQueue = [];

    /**
     * An array of reply-to names and addresses queued for validation.
     * In send(), valid and non duplicate entries are moved to $ReplyTo.
     * This array is used only for addresses with IDN.
     *
     * @var array
     * @see PHPMailer::$ReplyTo
     */
    protected $ReplyToQueue = [];

    /**
     * The array of attachments.
     *
     * @var array
     */
    protected $attachment = [];

    /**
     * The array of custom headers.
     *
     * @var array
     */
    protected $CustomHeader = [];

    /**
     * The most recent Message-ID (including angular brackets).
     *
     * @var string
     */
    protected $lastMessageID = '';

    /**
     * The message's MIME type.
     *
     * @var string
     */
    protected $message_type = '';

    /**
     * The array of MIME boundary strings.
     *
     * @var array
     */
    protected $boundary = [];

    /**
     * The array of available languages.
     *
     * @var array
     */
    protected $language = [];

    /**
     * The number of errors encountered.
     *
     * @var integer
     */
    protected $error_count = 0;

    /**
     * The S/MIME certificate file path.
     *
     * @var string
     */
    protected $sign_cert_file = '';

    /**
     * The S/MIME key file path.
     *
     * @var string
     */
    protected $sign_key_file = '';

    /**
     * The optional S/MIME extra certificates ("CA Chain") file path.
     *
     * @var string
     */
    protected $sign_extracerts_file = '';

    /**
     * The S/MIME password for the key.
     * Used only if the key is encrypted.
     *
     * @var string
     */
    protected $sign_key_pass = '';

    /**
     * Whether to throw exceptions for errors.
     *
     * @var boolean
     */
    protected $exceptions = false;

    /**
     * Unique ID used for message ID and boundaries.
     *
     * @var string
     */
    protected $uniqueid = '';

    /**
     * The PHPMailer Version number.
     *
     * @var string
     */
    const VERSION = '6.0.0';

    /**
     * Error severity: message only, continue processing.
     *
     * @var integer
     */
    const STOP_MESSAGE = 0;

    /**
     * Error severity: message, likely ok to continue processing.
     *
     * @var integer
     */
    const STOP_CONTINUE = 1;

    /**
     * Error severity: message, plus full stop, critical error reached.
     *
     * @var integer
     */
    const STOP_CRITICAL = 2;

    /**
     * SMTP RFC standard line ending.
     *
     * @var string
     */
    protected static $LE = "\r\n";

    /**
     * The maximum line length allowed by RFC 2822 section 2.1.1
     *
     * @var integer
     */
    const MAX_LINE_LENGTH = 998;

    /**
     * The lower maximum line length allowed by RFC 2822 section 2.1.1
     *
     * @var integer
     */
    const STD_LINE_LENGTH = 78;

    /**
     * Constructor.
     *
     * @param boolean $exceptions Should we throw external exceptions?
     */
    public function __construct($exceptions = null)
    {
        if (!is_null($exceptions)) {
            $this->exceptions = (boolean)$exceptions;
        }
        //Pick an appropriate debug output format automatically
        $this->Debugoutput = (strpos(PHP_SAPI, 'cli') !== false ? 'echo' : 'html');
    }

    /**
     * Destructor.
     */
    public function __destruct()
    {
        //Close any open SMTP connection nicely
        $this->smtpClose();
    }

    /**
     * Call mail() in a safe_mode-aware fashion.
     * Also, unless sendmail_path points to sendmail (or something that
     * claims to be sendmail), don't pass params (not a perfect fix,
     * but it will do)
     *
     * @param string $to To
     * @param string $subject Subject
     * @param string $body Message Body
     * @param string $header Additional Header(s)
     * @param ?string $params Params

The doc-type ?string could not be parsed: Unknown type name "?string" at position 0. (view supported doc-types)

     *
     * @return boolean
     */
    private function mailPassthru($to, $subject, $body, $header, $params)
    {
        //Check overloading of mail function to avoid double-encoding
        if (ini_get('mbstring.func_overload') & 1) {
            $subject = $this->secureHeader($subject);
        } else {
            $subject = $this->encodeHeader($this->secureHeader($subject));
        }
        //Calling mail() with null params breaks
        if (!$this->UseSendmailOptions or is_null($params)) {
            $result = @mail($to, $subject, $body, $header);
        } else {
            $result = @mail($to, $subject, $body, $header, $params);
        }
        return $result;
    }

    /**
     * Output debugging info via user-defined method.
     * Only generates output if SMTP debug output is enabled (@see SMTP::$do_debug).
     *
     * @param string $str
     *
     * @see PHPMailer::$Debugoutput
     * @see PHPMailer::$SMTPDebug
     */
    protected function edebug($str)
    {
        if ($this->SMTPDebug <= 0) {
            return;
        }
        //Is this a PSR-3 logger?
        if (is_a($this->Debugoutput, 'Psr\Log\LoggerInterface')) {
            $this->Debugoutput->debug($str);

The method debug cannot be called on $this->Debugoutput (of type callable).

            return;
        }
        //Avoid clash with built-in function names
        if (!in_array($this->Debugoutput, ['error_log', 'html', 'echo']) and is_callable($this->Debugoutput)) {
            call_user_func($this->Debugoutput, $str, $this->SMTPDebug);
            return;
        }
        switch ($this->Debugoutput) {
            case 'error_log':
                //Don't output, just log
                error_log($str);
                break;
            case 'html':
                //Cleans up output a bit for a better looking, HTML-safe output
                echo htmlentities(
                    preg_replace('/[\r\n]+/', '', $str),
                    ENT_QUOTES,
                    'UTF-8'
                ), "<br>\n";
                break;
            case 'echo':
            default:
                //Normalize line breaks
                $str = preg_replace('/\r\n|\r/ms', "\n", $str);
                echo gmdate('Y-m-d H:i:s'),
                    "\t",
                    //Trim trailing space
                    trim(
                        //Indent for readability, except for trailing break
                        str_replace(
                            "\n",
                            "\n                   \t                  ",
                            trim($str)
                        )
                    ),
                    "\n";
        }
    }

    /**
     * Sets message type to HTML or plain.
     *
     * @param boolean $isHtml True for HTML mode.
     */
    public function isHTML($isHtml = true)
    {
        if ($isHtml) {
            $this->ContentType = 'text/html';
        } else {
            $this->ContentType = 'text/plain';
        }
    }

    /**
     * Send messages using SMTP.
     */
    public function isSMTP()
    {
        $this->Mailer = 'smtp';
    }

    /**
     * Send messages using PHP's mail() function.
     */
    public function isMail()
    {
        $this->Mailer = 'mail';
    }

    /**
     * Send messages using $Sendmail.
     */
    public function isSendmail()
    {
        $ini_sendmail_path = ini_get('sendmail_path');

        if (!stristr($ini_sendmail_path, 'sendmail')) {
            $this->Sendmail = '/usr/sbin/sendmail';
        } else {
            $this->Sendmail = $ini_sendmail_path;
        }
        $this->Mailer = 'sendmail';
    }

    /**
     * Send messages using qmail.
     */
    public function isQmail()
    {
        $ini_sendmail_path = ini_get('sendmail_path');

        if (!stristr($ini_sendmail_path, 'qmail')) {
            $this->Sendmail = '/var/qmail/bin/qmail-inject';
        } else {
            $this->Sendmail = $ini_sendmail_path;
        }
        $this->Mailer = 'qmail';
    }

    /**
     * Add a "To" address.
     *
     * @param string $address The email address to send to
     * @param string $name
     *
     * @return boolean true on success, false if address already used or invalid in some way
     */
    public function addAddress($address, $name = '')
    {
        return $this->addOrEnqueueAnAddress('to', $address, $name);
    }

    /**
     * Add a "CC" address.
     *
     * @param string $address The email address to send to
     * @param string $name
     *
     * @return boolean true on success, false if address already used or invalid in some way
     */
    public function addCC($address, $name = '')
    {
        return $this->addOrEnqueueAnAddress('cc', $address, $name);
    }

    /**
     * Add a "BCC" address.
     *
     * @param string $address The email address to send to
     * @param string $name
     *
     * @return boolean true on success, false if address already used or invalid in some way
     */
    public function addBCC($address, $name = '')
    {
        return $this->addOrEnqueueAnAddress('bcc', $address, $name);
    }

    /**
     * Add a "Reply-To" address.
     *
     * @param string $address The email address to reply to
     * @param string $name
     *
     * @return boolean true on success, false if address already used or invalid in some way
     */
    public function addReplyTo($address, $name = '')
    {
        return $this->addOrEnqueueAnAddress('Reply-To', $address, $name);
    }

    /**
     * Add an address to one of the recipient arrays or to the ReplyTo array. Because PHPMailer
     * can't validate addresses with an IDN without knowing the PHPMailer::$CharSet (that can still
     * be modified after calling this function), addition of such addresses is delayed until send().
     * Addresses that have been added already return false, but do not throw exceptions.
     *
     * @param string $kind One of 'to', 'cc', 'bcc', or 'ReplyTo'
     * @param string $address The email address to send, resp. to reply to
     * @param string $name
     *
     * @throws Exception
     * @return boolean true on success, false if address already used or invalid in some way
     */
    protected function addOrEnqueueAnAddress($kind, $address, $name)
    {
        $address = trim($address);
        $name = trim(preg_replace('/[\r\n]+/', '', $name)); //Strip breaks and trim
        $pos = strrpos($address, '@');
        if (false === $pos) {
            // At-sign is missing.
            $error_message = $this->lang('invalid_address') . " (addAnAddress $kind): $address";
            $this->setError($error_message);
            $this->edebug($error_message);
            if ($this->exceptions) {
                throw new Exception($error_message);
            }
            return false;
        }
        $params = [$kind, $address, $name];
        // Enqueue addresses with IDN until we know the PHPMailer::$CharSet.
        if ($this->has8bitChars(substr($address, ++$pos)) and $this->idnSupported()) {
            if ('Reply-To' != $kind) {
                if (!array_key_exists($address, $this->RecipientsQueue)) {
                    $this->RecipientsQueue[$address] = $params;
                    return true;
                }
            } else {
                if (!array_key_exists($address, $this->ReplyToQueue)) {
                    $this->ReplyToQueue[$address] = $params;
                    return true;
                }
            }
            return false;
        }
        // Immediately add standard addresses without IDN.
        return call_user_func_array([$this, 'addAnAddress'], $params);
    }

    /**
     * Add an address to one of the recipient arrays or to the ReplyTo array.
     * Addresses that have been added already return false, but do not throw exceptions.
     *
     * @param string $kind One of 'to', 'cc', 'bcc', or 'ReplyTo'
     * @param string $address The email address to send, resp. to reply to
     * @param string $name
     *
     * @throws Exception
     * @return boolean true on success, false if address already used or invalid in some way
     */
    protected function addAnAddress($kind, $address, $name = '')
    {
        if (!in_array($kind, ['to', 'cc', 'bcc', 'Reply-To'])) {
            $error_message = $this->lang('Invalid recipient kind: ') . $kind;
            $this->setError($error_message);
            $this->edebug($error_message);
            if ($this->exceptions) {
                throw new Exception($error_message);
            }
            return false;
        }
        if (!static::validateAddress($address)) {
            $error_message = $this->lang('invalid_address') . " (addAnAddress $kind): $address";
            $this->setError($error_message);
            $this->edebug($error_message);
            if ($this->exceptions) {
                throw new Exception($error_message);
            }
            return false;
        }
        if ('Reply-To' != $kind) {
            if (!array_key_exists(strtolower($address), $this->all_recipients)) {
                array_push($this->$kind, [$address, $name]);
                $this->all_recipients[strtolower($address)] = true;
                return true;
            }
        } else {
            if (!array_key_exists(strtolower($address), $this->ReplyTo)) {
                $this->ReplyTo[strtolower($address)] = [$address, $name];
                return true;
            }
        }
        return false;
    }

    /**
     * Parse and validate a string containing one or more RFC822-style comma-separated email addresses
     * of the form "display name <address>" into an array of name/address pairs.
     * Uses the imap_rfc822_parse_adrlist function if the IMAP extension is available.
     * Note that quotes in the name part are removed.
     *
     * @param string $addrstr The address list string
     * @param boolean $useimap Whether to use the IMAP extension to parse the list
     *
     * @return array
     * @see    http://www.andrew.cmu.edu/user/agreen1/testing/mrbs/web/Mail/RFC822.php A more careful implementation
     */
    public static function parseAddresses($addrstr, $useimap = true)
    {
        $addresses = [];
        if ($useimap and function_exists('imap_rfc822_parse_adrlist')) {
            //Use this built-in parser if it's available
            $list = imap_rfc822_parse_adrlist($addrstr, '');
            foreach ($list as $address) {
                if ('.SYNTAX-ERROR.' != $address->host) {
                    if (static::validateAddress($address->mailbox . '@' . $address->host)) {
                        $addresses[] = [
                            'name' => (property_exists($address, 'personal') ? $address->personal : ''),
                            'address' => $address->mailbox . '@' . $address->host
                        ];
                    }
                }
            }
        } else {
            //Use this simpler parser
            $list = explode(',', $addrstr);
            foreach ($list as $address) {
                $address = trim($address);
                //Is there a separate name part?
                if (strpos($address, '<') === false) {
                    //No separate name, just use the whole thing
                    if (static::validateAddress($address)) {
                        $addresses[] = [
                            'name' => '',
                            'address' => $address
                        ];
                    }
                } else {
                    list($name, $email) = explode('<', $address);
                    $email = trim(str_replace('>', '', $email));
                    if (static::validateAddress($email)) {
                        $addresses[] = [
                            'name' => trim(str_replace(['"', "'"], '', $name)),
                            'address' => $email
                        ];
                    }
                }
            }
        }
        return $addresses;
    }

    /**
     * Set the From and FromName properties.
     *
     * @param string $address
     * @param string $name
     * @param boolean $auto Whether to also set the Sender address, defaults to true
     *
     * @throws Exception
     * @return boolean
     */
    public function setFrom($address, $name = '', $auto = true)
    {
        $address = trim($address);
        $name = trim(preg_replace('/[\r\n]+/', '', $name)); //Strip breaks and trim
        // Don't validate now addresses with IDN. Will be done in send().
        $pos = strrpos($address, '@');
        if (false === $pos or
            (!$this->has8bitChars(substr($address, ++$pos)) or !$this->idnSupported()) and
            !static::validateAddress($address)) {
            $error_message = $this->lang('invalid_address') . " (setFrom) $address";
            $this->setError($error_message);
            $this->edebug($error_message);
            if ($this->exceptions) {
                throw new Exception($error_message);
            }
            return false;
        }
        $this->From = $address;
        $this->FromName = $name;
        if ($auto) {
            if (empty($this->Sender)) {
                $this->Sender = $address;
            }
        }
        return true;
    }

    /**
     * Return the Message-ID header of the last email.
     * Technically this is the value from the last time the headers were created,
     * but it's also the message ID of the last sent message except in
     * pathological cases.
     *
     * @return string
     */
    public function getLastMessageID()
    {
        return $this->lastMessageID;
    }

    /**
     * Check that a string looks like an email address.
     *
     * @param string $address The email address to check
     * @param string|callable $patternselect A selector for the validation pattern to use :
     * * `auto` Pick best pattern automatically;
     * * `pcre8` Use the squiloople.com pattern, requires PCRE > 8.0;
     * * `pcre` Use old PCRE implementation;
     * * `php` Use PHP built-in FILTER_VALIDATE_EMAIL;
     * * `html5` Use the pattern given by the HTML5 spec for 'email' type form input elements.
     * * `noregex` Don't use a regex: super fast, really dumb.
     * Alternatively you may pass in a callable to inject your own validator, for example:
     * PHPMailer::validateAddress('user@example.com', function($address) {
     *     return (strpos($address, '@') !== false);
     * });
     * You can also set the PHPMailer::$validator static to a callable, allowing built-in methods to use your validator.
     *
     * @return boolean
     */
    public static function validateAddress($address, $patternselect = null)
    {
        if (is_null($patternselect)) {
            $patternselect = static::$validator;
        }
        if (is_callable($patternselect)) {
            return call_user_func($patternselect, $address);
        }
        //Reject line breaks in addresses; it's valid RFC5322, but not RFC5321
        if (strpos($address, "\n") !== false or strpos($address, "\r") !== false) {
            return false;
        }
        switch ($patternselect) {
            case 'pcre': //Kept for BC
            case 'pcre8':
                /**
                 * A more complex and more permissive version of the RFC5322 regex on which FILTER_VALIDATE_EMAIL
                 * is based.
                 * In addition to the addresses allowed by filter_var, also permits:
                 *  * dotless domains: `a@b`
                 *  * comments: `1234 @ local(blah) .machine .example`
                 *  * quoted elements: `'"test blah"@example.org'`
                 *  * numeric TLDs: `a@b.123`
                 *  * unbracketed IPv4 literals: `a@192.168.0.1`
                 *  * IPv6 literals: 'first.last@[IPv6:a1::]'
                 * Not all of these will necessarily work for sending!
                 *
                 * @see       http://squiloople.com/2009/12/20/email-address-validation/
                 * @copyright 2009-2010 Michael Rushton
                 * Feel free to use and redistribute this code. But please keep this copyright notice.
                 */
                return (boolean)preg_match(
                    '/^(?!(?>(?1)"?(?>\\\[ -~]|[^"])"?(?1)){255,})(?!(?>(?1)"?(?>\\\[ -~]|[^"])"?(?1)){65,}@)' .
                    '((?>(?>(?>((?>(?>(?>\x0D\x0A)?[\t ])+|(?>[\t ]*\x0D\x0A)?[\t ]+)?)(\((?>(?2)' .
                    '(?>[\x01-\x08\x0B\x0C\x0E-\'*-\[\]-\x7F]|\\\[\x00-\x7F]|(?3)))*(?2)\)))+(?2))|(?2))?)' .
                    '([!#-\'*+\/-9=?^-~-]+|"(?>(?2)(?>[\x01-\x08\x0B\x0C\x0E-!#-\[\]-\x7F]|\\\[\x00-\x7F]))*' .
                    '(?2)")(?>(?1)\.(?1)(?4))*(?1)@(?!(?1)[a-z0-9-]{64,})(?1)(?>([a-z0-9](?>[a-z0-9-]*[a-z0-9])?)' .
                    '(?>(?1)\.(?!(?1)[a-z0-9-]{64,})(?1)(?5)){0,126}|\[(?:(?>IPv6:(?>([a-f0-9]{1,4})(?>:(?6)){7}' .
                    '|(?!(?:.*[a-f0-9][:\]]){8,})((?6)(?>:(?6)){0,6})?::(?7)?))|(?>(?>IPv6:(?>(?6)(?>:(?6)){5}:' .
                    '|(?!(?:.*[a-f0-9]:){6,})(?8)?::(?>((?6)(?>:(?6)){0,4}):)?))?(25[0-5]|2[0-4][0-9]|1[0-9]{2}' .
                    '|[1-9]?[0-9])(?>\.(?9)){3}))\])(?1)$/isD',
                    $address
                );
            case 'html5':
                /**
                 * This is the pattern used in the HTML5 spec for validation of 'email' type form input elements.
                 *
                 * @see http://www.whatwg.org/specs/web-apps/current-work/#e-mail-state-(type=email)
                 */
                return (boolean)preg_match(
                    '/^[a-zA-Z0-9.!#$%&\'*+\/=?^_`{|}~-]+@[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}' .
                    '[a-zA-Z0-9])?(?:\.[a-zA-Z0-9](?:[a-zA-Z0-9-]{0,61}[a-zA-Z0-9])?)*$/sD',
                    $address
                );
            case 'noregex': //Kept for BC
            case 'php':
            default:
                return (boolean)filter_var($address, FILTER_VALIDATE_EMAIL);
        }
    }

    /**
     * Tells whether IDNs (Internationalized Domain Names) are supported or not. This requires the
     * `intl` and `mbstring` PHP extensions.
     *
     * @return boolean `true` if required functions for IDN support are present
     */
    public function idnSupported()
    {
        return function_exists('idn_to_ascii') and function_exists('mb_convert_encoding');
    }

    /**
     * Converts IDN in given email address to its ASCII form, also known as punycode, if possible.
     * Important: Address must be passed in same encoding as currently set in PHPMailer::$CharSet.
     * This function silently returns unmodified address if:
     * - No conversion is necessary (i.e. domain name is not an IDN, or is already in ASCII form)
     * - Conversion to punycode is impossible (e.g. required PHP functions are not available)
     *   or fails for any reason (e.g. domain has characters not allowed in an IDN)
     *
     * @param string $address The email address to convert
     *
     * @see    PHPMailer::$CharSet
     * @return string The encoded address in ASCII form
     */
    public function punyencodeAddress($address)
    {
        // Verify we have required functions, CharSet, and at-sign.
        $pos = strrpos($address, '@');
        if ($this->idnSupported() and
            !empty($this->CharSet) and
            false !== $pos
        ) {
            $domain = substr($address, ++$pos);
            // Verify CharSet string is a valid one, and domain properly encoded in this CharSet.
            if ($this->has8bitChars($domain) and @mb_check_encoding($domain, $this->CharSet)) {
                $domain = mb_convert_encoding($domain, 'UTF-8', $this->CharSet);
                //Ignore IDE complaints about this line - method signature changed in PHP 5.4
                $errorcode = 0;
                $punycode = idn_to_ascii($domain, $errorcode, INTL_IDNA_VARIANT_UTS46);
                if (false !== $punycode) {
                    return substr($address, 0, $pos) . $punycode;
                }
            }
        }
        return $address;
    }

    /**
     * Create a message and send it.
     * Uses the sending method specified by $Mailer.
     *
     * @return boolean false on error - See the ErrorInfo property for details of the error.
     * @throws Exception
     */
    public function send()
    {
        try {
            if (!$this->preSend()) {
                return false;
            }
            return $this->postSend();
        } catch (Exception $exc) {
            $this->mailHeader = '';
            $this->setError($exc->getMessage());
            if ($this->exceptions) {
                throw $exc;
            }
            return false;
        }
    }

    /**
     * Prepare a message for sending.
     *
     * @throws Exception
     * @return boolean
     */
    public function preSend()

This operation has 96832 execution paths which exceeds the configured maximum of 200.

    {
        if ('smtp' == $this->Mailer or
            ('mail' == $this->Mailer and stripos(PHP_OS, 'WIN') === 0)
        ) {
            //SMTP mandates RFC-compliant line endings
            //and it's also used with mail() on Windows
            static::setLE("\r\n");
        } else {
            //Maintain backward compatibility with legacy Linux command line mailers
            static::setLE(PHP_EOL);
        }
        //Check for buggy PHP versions that add a header with an incorrect line break
        if (ini_get('mail.add_x_header') == 1
            and 'mail' == $this->Mailer
            and stripos(PHP_OS, 'WIN') === 0
            and ((version_compare(PHP_VERSION, '7.0.0', '>=')
                    and version_compare(PHP_VERSION, '7.0.17', '<'))
                or (version_compare(PHP_VERSION, '7.1.0', '>=')
                    and version_compare(PHP_VERSION, '7.1.3', '<')))
        ) {
            trigger_error(
                'Your version of PHP is affected by a bug that may result in corrupted messages.' .
                ' To fix it, switch to sending using SMTP, disable the mail.add_x_header option in' .
                ' your php.ini, switch to MacOS or Linux, or upgrade your PHP to version 7.0.17+ or 7.1.3+.',
                E_USER_WARNING
            );
        }

        try {
            $this->error_count = 0; // Reset errors
            $this->mailHeader = '';

            // Dequeue recipient and Reply-To addresses with IDN
            foreach (array_merge($this->RecipientsQueue, $this->ReplyToQueue) as $params) {
                $params[1] = $this->punyencodeAddress($params[1]);
                call_user_func_array([$this, 'addAnAddress'], $params);
            }
            if (count($this->to) + count($this->cc) + count($this->bcc) < 1) {
                throw new Exception($this->lang('provide_address'), self::STOP_CRITICAL);
            }

            // Validate From, Sender, and ConfirmReadingTo addresses
            foreach (['From', 'Sender', 'ConfirmReadingTo'] as $address_kind) {
                $this->$address_kind = trim($this->$address_kind);
                if (empty($this->$address_kind)) {
                    continue;
                }
                $this->$address_kind = $this->punyencodeAddress($this->$address_kind);
                if (!static::validateAddress($this->$address_kind)) {
                    $error_message = $this->lang('invalid_address') . ' (punyEncode) ' . $this->$address_kind;
                    $this->setError($error_message);
                    $this->edebug($error_message);
                    if ($this->exceptions) {
                        throw new Exception($error_message);
                    }
                    return false;
                }
            }

            // Set whether the message is multipart/alternative
            if ($this->alternativeExists()) {
                $this->ContentType = 'multipart/alternative';
            }

            $this->setMessageType();
            // Refuse to send an empty message unless we are specifically allowing it
            if (!$this->AllowEmpty and empty($this->Body)) {
                throw new Exception($this->lang('empty_message'), self::STOP_CRITICAL);
            }

            //Trim subject consistently
            $this->Subject = trim($this->Subject);
            // Create body before headers in case body makes changes to headers (e.g. altering transfer encoding)
            $this->MIMEHeader = '';
            $this->MIMEBody = $this->createBody();
            // createBody may have added some headers, so retain them
            $tempheaders = $this->MIMEHeader;
            $this->MIMEHeader = $this->createHeader();
            $this->MIMEHeader .= $tempheaders;

            // To capture the complete message when using mail(), create
            // an extra header list which createHeader() doesn't fold in
            if ('mail' == $this->Mailer) {
                if (count($this->to) > 0) {
                    $this->mailHeader .= $this->addrAppend('To', $this->to);
                } else {
                    $this->mailHeader .= $this->headerLine('To', 'undisclosed-recipients:;');
                }
                $this->mailHeader .= $this->headerLine(
                    'Subject',
                    $this->encodeHeader($this->secureHeader($this->Subject))
                );
            }

            // Sign with DKIM if enabled
            if (!empty($this->DKIM_domain)
                and !empty($this->DKIM_selector)
                and (!empty($this->DKIM_private_string)
                   or (!empty($this->DKIM_private) and file_exists($this->DKIM_private))
                )
            ) {
                $header_dkim = $this->DKIM_Add(
                    $this->MIMEHeader . $this->mailHeader,
                    $this->encodeHeader($this->secureHeader($this->Subject)),
                    $this->MIMEBody
                );
                $this->MIMEHeader = rtrim($this->MIMEHeader, "\r\n ") . static::$LE .
                    static::normalizeBreaks($header_dkim) . static::$LE;
            }
            return true;
        } catch (Exception $exc) {
            $this->setError($exc->getMessage());
            if ($this->exceptions) {
                throw $exc;
            }
            return false;
        }
    }

    /**
     * Actually send a message.
     * Send the email via the selected mechanism
     *
     * @return boolean
     * @throws Exception
     */
    public function postSend()
    {
        try {
            // Choose the mailer and send through it
            switch ($this->Mailer) {
                case 'sendmail':
                case 'qmail':
                    return $this->sendmailSend($this->MIMEHeader, $this->MIMEBody);
                case 'smtp':
                    return $this->smtpSend($this->MIMEHeader, $this->MIMEBody);
                case 'mail':
                    return $this->mailSend($this->MIMEHeader, $this->MIMEBody);
                default:
                    $sendMethod = $this->Mailer.'Send';
                    if (method_exists($this, $sendMethod)) {
                        return $this->$sendMethod($this->MIMEHeader, $this->MIMEBody);
                    }

                    return $this->mailSend($this->MIMEHeader, $this->MIMEBody);
            }
        } catch (Exception $exc) {
            $this->setError($exc->getMessage());
            $this->edebug($exc->getMessage());
            if ($this->exceptions) {
                throw $exc;
            }
        }
        return false;
    }

    /**
     * Send mail using the $Sendmail program.
     *
     * @param string $header The message headers
     * @param string $body The message body
     *
     * @see    PHPMailer::$Sendmail
     * @throws Exception
     * @return boolean
     */
    protected function sendmailSend($header, $body)
    {
        // CVE-2016-10033, CVE-2016-10045: Don't pass -f if characters will be escaped.
        if (!empty($this->Sender) and self::isShellSafe($this->Sender)) {
            if ('qmail' == $this->Mailer) {
                $sendmailFmt = '%s -f%s';
            } else {
                $sendmailFmt = '%s -oi -f%s -t';
            }
        } else {
            if ('qmail' == $this->Mailer) {
                $sendmailFmt = '%s';
            } else {
                $sendmailFmt = '%s -oi -t';
            }
        }

        $sendmail = sprintf($sendmailFmt, escapeshellcmd($this->Sendmail), $this->Sender);

        if ($this->SingleTo) {
            foreach ($this->SingleToArray as $toAddr) {
                $mail = @popen($sendmail, 'w');
                if (!$mail) {
                    throw new Exception($this->lang('execute') . $this->Sendmail, self::STOP_CRITICAL);
                }
                fwrite($mail, 'To: ' . $toAddr . "\n");
                fwrite($mail, $header);
                fwrite($mail, $body);
                $result = pclose($mail);
                $this->doCallback(
                    ($result == 0),
                    [$toAddr],
                    $this->cc,
                    $this->bcc,
                    $this->Subject,
                    $body,
                    $this->From
                );
                if (0 !== $result) {
                    throw new Exception($this->lang('execute') . $this->Sendmail, self::STOP_CRITICAL);
                }
            }
        } else {
            $mail = @popen($sendmail, 'w');
            if (!$mail) {
                throw new Exception($this->lang('execute') . $this->Sendmail, self::STOP_CRITICAL);
            }
            fwrite($mail, $header);
            fwrite($mail, $body);
            $result = pclose($mail);
            $this->doCallback(
                ($result == 0),
                $this->to,
                $this->cc,
                $this->bcc,
                $this->Subject,
                $body,
                $this->From
            );
            if (0 !== $result) {
                throw new Exception($this->lang('execute') . $this->Sendmail, self::STOP_CRITICAL);
            }
        }
        return true;
    }

    /**
     * Fix CVE-2016-10033 and CVE-2016-10045 by disallowing potentially unsafe shell characters.
     *
     * Note that escapeshellarg and escapeshellcmd are inadequate for our purposes, especially on Windows.
     * @param string $string The string to be validated
     * @see https://github.com/PHPMailer/PHPMailer/issues/924 CVE-2016-10045 bug report
     * @access protected
     * @return boolean
     */
    protected static function isShellSafe($string)
    {
        // Future-proof
        if (escapeshellcmd($string) !== $string
            or !in_array(escapeshellarg($string), ["'$string'", "\"$string\""])
        ) {
            return false;
        }

        $length = strlen($string);

        for ($i = 0; $i < $length; ++$i) {
            $c = $string[$i];

Avoid variables with short names like $c. Configured minimum length is 3.

            // All other characters have a special meaning in at least one common shell, including = and +.
            // Full stop (.) has a special meaning in cmd.exe, but its impact should be negligible here.
            // Note that this does permit non-Latin alphanumeric characters based on the current locale.
            if (!ctype_alnum($c) && strpos('@_-.', $c) === false) {
                return false;
            }
        }

        return true;
    }

    /**
     * Send mail using the PHP mail() function.
     *
     * @param string $header The message headers
     * @param string $body The message body
     *
     * @see    http://www.php.net/manual/en/book.mail.php
     * @throws Exception
     * @return boolean
     */
    protected function mailSend($header, $body)
    {
        $toArr = [];
        foreach ($this->to as $toaddr) {
            $toArr[] = $this->addrFormat($toaddr);
        }
        $to = implode(', ', $toArr);

        $params = null;
        //This sets the SMTP envelope sender which gets turned into a return-path header by the receiver
        if (!empty($this->Sender) and static::validateAddress($this->Sender)) {
            //A space after `-f` is optional, but there is a long history of its presence
            //causing problems, so we don't use one
            //Exim docs: http://www.exim.org/exim-html-current/doc/html/spec_html/ch-the_exim_command_line.html
            //Sendmail docs: http://www.sendmail.org/~ca/email/man/sendmail.html
            //Qmail docs: http://www.qmail.org/man/man8/qmail-inject.html
            //Example problem: https://www.drupal.org/node/1057954
            // CVE-2016-10033, CVE-2016-10045: Don't pass -f if characters will be escaped.
            if (self::isShellSafe($this->Sender)) {
                $params = sprintf('-f%s', $this->Sender);
            }
        }
        if (!empty($this->Sender)and static::validateAddress($this->Sender)) {
            $old_from = ini_get('sendmail_from');
            ini_set('sendmail_from', $this->Sender);
        }
        $result = false;
        if ($this->SingleTo and count($toArr) > 1) {
            foreach ($toArr as $toAddr) {
                $result = $this->mailPassthru($toAddr, $this->Subject, $body, $header, $params);
                $this->doCallback($result, [$toAddr], $this->cc, $this->bcc, $this->Subject, $body, $this->From);
            }
        } else {
            $result = $this->mailPassthru($to, $this->Subject, $body, $header, $params);
            $this->doCallback($result, $this->to, $this->cc, $this->bcc, $this->Subject, $body, $this->From);
        }
        if (isset($old_from)) {
            ini_set('sendmail_from', $old_from);
        }
        if (!$result) {
            throw new Exception($this->lang('instantiate'), self::STOP_CRITICAL);
        }
        return true;
    }

    /**
     * Get an instance to use for SMTP operations.
     * Override this function to load your own SMTP implementation,
     * or set one with setSMTPInstance.
     *
     * @return SMTP
     */
    public function getSMTPInstance()
    {
        if (!is_object($this->smtp)) {
            $this->smtp = new SMTP;
        }
        return $this->smtp;
    }

    /**
     * Provide an instance to use for SMTP operations.
     *
     * @param SMTP $smtp
     * @return SMTP
     */
    public function setSMTPInstance(SMTP $smtp)
    {
        $this->smtp = $smtp;
        return $this->smtp;
    }

    /**
     * Send mail via SMTP.
     * Returns false if there is a bad MAIL FROM, RCPT, or DATA input.
     * Uses the PHPMailerSMTP class by default.
     *
     * @param string $header The message headers
     * @param string $body The message body
     *
     * @see    PHPMailer::getSMTPInstance() to use a different class.
     * @throws Exception
     * @uses   SMTP
     * @return boolean
     */
    protected function smtpSend($header, $body)

This operation has 576 execution paths which exceeds the configured maximum of 200.

    {
        $bad_rcpt = [];
        if (!$this->smtpConnect($this->SMTPOptions)) {
            throw new Exception($this->lang('smtp_connect_failed'), self::STOP_CRITICAL);
        }
        //Sender already validated in preSend()
        if ('' == $this->Sender) {
            $smtp_from = $this->From;
        } else {
            $smtp_from = $this->Sender;
        }
        if (!$this->smtp->mail($smtp_from)) {
            $this->setError($this->lang('from_failed') . $smtp_from . ' : ' . implode(',', $this->smtp->getError()));
            throw new Exception($this->ErrorInfo, self::STOP_CRITICAL);
        }

        // Attempt to send to all recipients
        foreach ([$this->to, $this->cc, $this->bcc] as $togroup) {
            foreach ($togroup as $to) {
                if (!$this->smtp->recipient($to[0])) {
                    $error = $this->smtp->getError();
                    $bad_rcpt[] = ['to' => $to[0], 'error' => $error['detail']];
                    $isSent = false;
                } else {
                    $isSent = true;
                }
                $this->doCallback($isSent, [$to[0]], [], [], $this->Subject, $body, $this->From);
            }
        }

        // Only send the DATA command if we have viable recipients
        if ((count($this->all_recipients) > count($bad_rcpt)) and !$this->smtp->data($header . $body)) {
            throw new Exception($this->lang('data_not_accepted'), self::STOP_CRITICAL);
        }
        if ($this->SMTPKeepAlive) {
            $this->smtp->reset();
        } else {
            $this->smtp->quit();
            $this->smtp->close();
        }
        //Create error message for any bad addresses
        if (count($bad_rcpt) > 0) {
            $errstr = '';
            foreach ($bad_rcpt as $bad) {
                $errstr .= $bad['to'] . ': ' . $bad['error'];
            }
            throw new Exception(
                $this->lang('recipients_failed') . $errstr,
                self::STOP_CONTINUE
            );
        }
        return true;
    }

    /**
     * Initiate a connection to an SMTP server.
     * Returns false if the operation failed.
     *
     * @param array $options An array of options compatible with stream_context_create()
     *
     * @return boolean
     * @throws Exception
     * @uses   SMTP
     */
    public function smtpConnect($options = null)

This operation has 529944 execution paths which exceeds the configured maximum of 200.

    {
        if (is_null($this->smtp)) {
            $this->smtp = $this->getSMTPInstance();
        }

        //If no options are provided, use whatever is set in the instance
        if (is_null($options)) {
            $options = $this->SMTPOptions;
        }

        // Already connected?
        if ($this->smtp->connected()) {
            return true;
        }

        $this->smtp->setTimeout($this->Timeout);
        $this->smtp->setDebugLevel($this->SMTPDebug);
        $this->smtp->setDebugOutput($this->Debugoutput);
        $this->smtp->setVerp($this->do_verp);
        $hosts = explode(';', $this->Host);
        $lastexception = null;

        foreach ($hosts as $hostentry) {
            $hostinfo = [];
            if (!preg_match('/^((ssl|tls):\/\/)*([a-zA-Z0-9\.-]*|\[[a-fA-F0-9:]+\]):?([0-9]*)$/', trim($hostentry), $hostinfo)) {
                static::edebug($this->lang('connect_host') . ' ' . $hostentry);
                // Not a valid host entry
                continue;
            }
            // $hostinfo[2]: optional ssl or tls prefix
            // $hostinfo[3]: the hostname
            // $hostinfo[4]: optional port number
            // The host string prefix can temporarily override the current setting for SMTPSecure
            // If it's not specified, the default value is used

            //Check the host name is a valid name or IP address before trying to use it
            if (!static::isValidHost($hostinfo[3])) {
                static::edebug($this->lang('connect_host'). ' ' . $hostentry);
                continue;
            }
            $prefix = '';
            $secure = $this->SMTPSecure;
            $tls = ('tls' == $this->SMTPSecure);
            if ('ssl' == $hostinfo[2] or ('' == $hostinfo[2] and 'ssl' == $this->SMTPSecure)) {
                $prefix = 'ssl://';
                $tls = false; // Can't have SSL and TLS at the same time
                $secure = 'ssl';
            } elseif ('tls' == $hostinfo[2]) {
                $tls = true;
                // tls doesn't use a prefix
                $secure = 'tls';
            }
            //Do we need the OpenSSL extension?
            $sslext = defined('OPENSSL_ALGO_SHA256');
            if ('tls' === $secure or 'ssl' === $secure) {
                //Check for an OpenSSL constant rather than using extension_loaded, which is sometimes disabled
                if (!$sslext) {
                    throw new Exception($this->lang('extension_missing').'openssl', self::STOP_CRITICAL);
                }
            }
            $host = $hostinfo[3];
            $port = $this->Port;
            $tport = (integer)$hostinfo[4];
            if ($tport > 0 and $tport < 65536) {
                $port = $tport;
            }
            if ($this->smtp->connect($prefix . $host, $port, $this->Timeout, $options)) {
                try {
                    if ($this->Helo) {
                        $hello = $this->Helo;
                    } else {
                        $hello = $this->serverHostname();
                    }
                    $this->smtp->hello($hello);
                    //Automatically enable TLS encryption if:
                    // * it's not disabled
                    // * we have openssl extension
                    // * we are not already using SSL
                    // * the server offers STARTTLS
                    if ($this->SMTPAutoTLS and $sslext and $secure != 'ssl' and $this->smtp->getServerExt('STARTTLS')) {
                        $tls = true;
                    }
                    if ($tls) {
                        if (!$this->smtp->startTLS()) {
                            throw new Exception($this->lang('connect_host'));
                        }
                        // We must resend EHLO after TLS negotiation
                        $this->smtp->hello($hello);
                    }
                    if ($this->SMTPAuth) {
                        if (!$this->smtp->authenticate(
                            $this->Username,
                            $this->Password,
                            $this->AuthType,
                            $this->oauth
                        )
                        ) {
                            throw new Exception($this->lang('authenticate'));
                        }
                    }
                    return true;
                } catch (Exception $exc) {
                    $lastexception = $exc;
                    $this->edebug($exc->getMessage());
                    // We must have connected, but then failed TLS or Auth, so close connection nicely
                    $this->smtp->quit();
                }
            }
        }
        // If we get here, all connection attempts have failed, so close connection hard
        $this->smtp->close();
        // As we've caught all exceptions, just report whatever the last one was
        if ($this->exceptions and !is_null($lastexception)) {
            throw $lastexception;
        }
        return false;
    }

    /**
     * Close the active SMTP session if one exists.
     */
    public function smtpClose()
    {
        if (!is_null($this->smtp)) {
            if ($this->smtp->connected()) {
                $this->smtp->quit();
                $this->smtp->close();
            }
        }
    }

    /**
     * Set the language for error messages.
     * Returns false if it cannot load the language file.
     * The default language is English.
     *
     * @param string $langcode ISO 639-1 2-character language code (e.g. French is "fr")
     * @param string $lang_path Path to the language file directory, with trailing separator (slash)
     *
     * @return boolean
     */
    public function setLanguage($langcode = 'en', $lang_path = '')
    {
        // Backwards compatibility for renamed language codes
        $renamed_langcodes = [
            'br' => 'pt_br',
            'cz' => 'cs',
            'dk' => 'da',
            'no' => 'nb',
            'se' => 'sv',
            'sr' => 'rs'
        ];

        if (isset($renamed_langcodes[$langcode])) {
            $langcode = $renamed_langcodes[$langcode];
        }

        // Define full set of translatable strings in English
        $PHPMAILER_LANG = [
            'authenticate' => 'SMTP Error: Could not authenticate.',
            'connect_host' => 'SMTP Error: Could not connect to SMTP host.',
            'data_not_accepted' => 'SMTP Error: data not accepted.',
            'empty_message' => 'Message body empty',
            'encoding' => 'Unknown encoding: ',
            'execute' => 'Could not execute: ',
            'file_access' => 'Could not access file: ',
            'file_open' => 'File Error: Could not open file: ',
            'from_failed' => 'The following From address failed: ',
            'instantiate' => 'Could not instantiate mail function.',
            'invalid_address' => 'Invalid address: ',
            'mailer_not_supported' => ' mailer is not supported.',
            'provide_address' => 'You must provide at least one recipient email address.',
            'recipients_failed' => 'SMTP Error: The following recipients failed: ',
            'signing' => 'Signing Error: ',
            'smtp_connect_failed' => 'SMTP connect() failed.',
            'smtp_error' => 'SMTP server error: ',
            'variable_set' => 'Cannot set or reset variable: ',
            'extension_missing' => 'Extension missing: '
        ];
        if (empty($lang_path)) {
            // Calculate an absolute path so it can work if CWD is not here
            $lang_path = dirname(__FILE__). DIRECTORY_SEPARATOR . 'language'. DIRECTORY_SEPARATOR;
        }
        //Validate $langcode
        if (!preg_match('/^[a-z]{2}(?:_[a-zA-Z]{2})?$/', $langcode)) {
            $langcode = 'en';
        }
        $foundlang = true;
        $lang_file = $lang_path . 'phpmailer.lang-' . $langcode . '.php';
        // There is no English translation file
        if ('en' != $langcode) {
            // Make sure language file path is readable
            if (!file_exists($lang_file)) {
                $foundlang = false;
            } else {
                // Overwrite language-specific strings.
                // This way we'll never have missing translation keys.
                $foundlang = include $lang_file;
            }
        }
        $this->language = $PHPMAILER_LANG;
        return (boolean)$foundlang; // Returns false if language not found
    }

    /**
     * Get the array of strings for the current language.
     *
     * @return array
     */
    public function getTranslations()
    {
        return $this->language;
    }

    /**
     * Create recipient headers.
     *
     * @param string $type
     * @param array $addr An array of recipient,
     * where each recipient is a 2-element indexed array with element 0 containing an address
     * and element 1 containing a name, like:
     * [['joe@example.com', 'Joe User'], ['zoe@example.com', 'Zoe User']]
     *
     * @return string
     */
    public function addrAppend($type, $addr)
    {
        $addresses = [];
        foreach ($addr as $address) {
            $addresses[] = $this->addrFormat($address);
        }
        return $type . ': ' . implode(', ', $addresses) . static::$LE;
    }

    /**
     * Format an address for use in a message header.
     *
     * @param array $addr A 2-element indexed array, element 0 containing an address, element 1 containing a name
     *      like ['joe@example.com', 'Joe User']
     *
     * @return string
     */
    public function addrFormat($addr)
    {
        if (empty($addr[1])) { // No name provided
            return $this->secureHeader($addr[0]);
        } else {
            return $this->encodeHeader($this->secureHeader($addr[1]), 'phrase') . ' <' . $this->secureHeader(
                $addr[0]
            ) . '>';
        }
    }

    /**
     * Word-wrap message.
     * For use with mailers that do not automatically perform wrapping
     * and for quoted-printable encoded messages.
     * Original written by philippe.
     *
     * @param string $message The message to wrap
     * @param integer $length The line length to wrap to
     * @param boolean $qp_mode Whether to run in Quoted-Printable mode
     *
     * @return string
     */
    public function wrapText($message, $length, $qp_mode = false)
    {
        if ($qp_mode) {
            $soft_break = sprintf(' =%s', static::$LE);
        } else {
            $soft_break = static::$LE;
        }
        // If utf-8 encoding is used, we will need to make sure we don't
        // split multibyte characters when we wrap
        $is_utf8 = (strtolower($this->CharSet) == 'utf-8');
        $lelen = strlen(static::$LE);
        $crlflen = strlen(static::$LE);

        $message = static::normalizeBreaks($message);
        //Remove a trailing line break
        if (substr($message, -$lelen) == static::$LE) {
            $message = substr($message, 0, -$lelen);
        }

        //Split message into lines
        $lines = explode(static::$LE, $message);
        //Message will be rebuilt in here
        $message = '';
        foreach ($lines as $line) {
            $words = explode(' ', $line);
            $buf = '';
            $firstword = true;
            foreach ($words as $word) {
                if ($qp_mode and (strlen($word) > $length)) {
                    $space_left = $length - strlen($buf) - $crlflen;
                    if (!$firstword) {
                        if ($space_left > 20) {
                            $len = $space_left;
                            if ($is_utf8) {
                                $len = $this->utf8CharBoundary($word, $len);
                            } elseif (substr($word, $len - 1, 1) == '=') {
                                --$len;
                            } elseif (substr($word, $len - 2, 1) == '=') {
                                $len -= 2;
                            }
                            $part = substr($word, 0, $len);
                            $word = substr($word, $len);
                            $buf .= ' ' . $part;
                            $message .= $buf . sprintf('=%s', static::$LE);
                        } else {
                            $message .= $buf . $soft_break;
                        }
                        $buf = '';
                    }
                    while (strlen($word) > 0) {
                        if ($length <= 0) {
                            break;
                        }
                        $len = $length;
                        if ($is_utf8) {
                            $len = $this->utf8CharBoundary($word, $len);
                        } elseif (substr($word, $len - 1, 1) == '=') {
                            --$len;
                        } elseif (substr($word, $len - 2, 1) == '=') {
                            $len -= 2;
                        }
                        $part = substr($word, 0, $len);
                        $word = substr($word, $len);

                        if (strlen($word) > 0) {
                            $message .= $part . sprintf('=%s', static::$LE);
                        } else {
                            $buf = $part;
                        }
                    }
                } else {
                    $buf_o = $buf;
                    if (!$firstword) {
                        $buf .= ' ';
                    }
                    $buf .= $word;

                    if (strlen($buf) > $length and $buf_o != '') {
                        $message .= $buf_o . $soft_break;
                        $buf = $word;
                    }
                }
                $firstword = false;
            }
            $message .= $buf . static::$LE;
        }

        return $message;
    }

    /**
     * Find the last character boundary prior to $maxLength in a utf-8
     * quoted-printable encoded string.
     * Original written by Colin Brown.
     *
     * @param string $encodedText utf-8 QP text
     * @param integer $maxLength Find the last character boundary prior to this length
     *
     * @return integer
     */
    public function utf8CharBoundary($encodedText, $maxLength)
    {
        $foundSplitPos = false;
        $lookBack = 3;
        while (!$foundSplitPos) {
            $lastChunk = substr($encodedText, $maxLength - $lookBack, $lookBack);
            $encodedCharPos = strpos($lastChunk, '=');
            if (false !== $encodedCharPos) {
                // Found start of encoded character byte within $lookBack block.
                // Check the encoded byte value (the 2 chars after the '=')
                $hex = substr($encodedText, $maxLength - $lookBack + $encodedCharPos + 1, 2);
                $dec = hexdec($hex);
                if ($dec < 128) {
                    // Single byte character.
                    // If the encoded char was found at pos 0, it will fit
                    // otherwise reduce maxLength to start of the encoded char
                    if ($encodedCharPos > 0) {
                        $maxLength -= $lookBack - $encodedCharPos;
                    }
                    $foundSplitPos = true;
                } elseif ($dec >= 192) {
                    // First byte of a multi byte character
                    // Reduce maxLength to split at start of character
                    $maxLength -= $lookBack - $encodedCharPos;
                    $foundSplitPos = true;
                } elseif ($dec < 192) {
                    // Middle byte of a multi byte character, look further back
                    $lookBack += 3;
                }
            } else {
                // No encoded character found
                $foundSplitPos = true;
            }
        }
        return $maxLength;
    }

    /**
     * Apply word wrapping to the message body.
     * Wraps the message body to the number of chars set in the WordWrap property.
     * You should only do this to plain-text bodies as wrapping HTML tags may break them.
     * This is called automatically by createBody(), so you don't need to call it yourself.
     */
    public function setWordWrap()
    {
        if ($this->WordWrap < 1) {
            return;
        }

        switch ($this->message_type) {
            case 'alt':
            case 'alt_inline':
            case 'alt_attach':
            case 'alt_inline_attach':
                $this->AltBody = $this->wrapText($this->AltBody, $this->WordWrap);
                break;
            default:
                $this->Body = $this->wrapText($this->Body, $this->WordWrap);
                break;
        }
    }

    /**
     * Assemble message headers.
     *
     * @return string The assembled headers
     */
    public function createHeader()

This operation has 201600 execution paths which exceeds the configured maximum of 200.

    {
        $result = '';

        $result .= $this->headerLine('Date', '' == $this->MessageDate ? self::rfcDate() : $this->MessageDate);

        // To be created automatically by mail()
        if ($this->SingleTo) {
            if ('mail' != $this->Mailer) {
                foreach ($this->to as $toaddr) {
                    $this->SingleToArray[] = $this->addrFormat($toaddr);
                }
            }
        } else {
            if (count($this->to) > 0) {
                if ('mail' != $this->Mailer) {
                    $result .= $this->addrAppend('To', $this->to);
                }
            } elseif (count($this->cc) == 0) {
                $result .= $this->headerLine('To', 'undisclosed-recipients:;');
            }
        }

        $result .= $this->addrAppend('From', [[trim($this->From), $this->FromName]]);

        // sendmail and mail() extract Cc from the header before sending
        if (count($this->cc) > 0) {
            $result .= $this->addrAppend('Cc', $this->cc);
        }

        // sendmail and mail() extract Bcc from the header before sending
        if ((
            'sendmail' == $this->Mailer or 'qmail' == $this->Mailer or 'mail' == $this->Mailer
            )
            and count($this->bcc) > 0
        ) {
            $result .= $this->addrAppend('Bcc', $this->bcc);
        }

        if (count($this->ReplyTo) > 0) {
            $result .= $this->addrAppend('Reply-To', $this->ReplyTo);
        }

        // mail() sets the subject itself
        if ('mail' != $this->Mailer) {
            $result .= $this->headerLine('Subject', $this->encodeHeader($this->secureHeader($this->Subject)));
        }

        // Only allow a custom message ID if it conforms to RFC 5322 section 3.6.4
        // https://tools.ietf.org/html/rfc5322#section-3.6.4
        if ('' != $this->MessageID and preg_match('/^<.*@.*>$/', $this->MessageID)) {
            $this->lastMessageID = $this->MessageID;
        } else {
            $this->lastMessageID = sprintf('<%s@%s>', $this->uniqueid, $this->serverHostname());
        }
        $result .= $this->headerLine('Message-ID', $this->lastMessageID);
        if (!is_null($this->Priority)) {
            $result .= $this->headerLine('X-Priority', $this->Priority);
        }
        if ('' == $this->XMailer) {
            $result .= $this->headerLine(
                'X-Mailer',
                'PHPMailer ' . self::VERSION . ' (https://github.com/PHPMailer/PHPMailer)'
            );
        } else {
            $myXmailer = trim($this->XMailer);
            if ($myXmailer) {
                $result .= $this->headerLine('X-Mailer', $myXmailer);
            }
        }

        if ('' != $this->ConfirmReadingTo) {
            $result .= $this->headerLine('Disposition-Notification-To', '<' . $this->ConfirmReadingTo . '>');
        }

        // Add custom headers
        foreach ($this->CustomHeader as $header) {
            $result .= $this->headerLine(
                trim($header[0]),
                $this->encodeHeader(trim($header[1]))
            );
        }
        if (!$this->sign_key_file) {
            $result .= $this->headerLine('MIME-Version', '1.0');
            $result .= $this->getMailMIME();
        }

        return $result;
    }

    /**
     * Get the message MIME type headers.
     *
     * @return string
     */
    public function getMailMIME()
    {
        $result = '';
        $ismultipart = true;
        switch ($this->message_type) {
            case 'inline':
                $result .= $this->headerLine('Content-Type', 'multipart/related;');
                $result .= $this->textLine("\tboundary=\"" . $this->boundary[1] . '"');
                break;
            case 'attach':
            case 'inline_attach':
            case 'alt_attach':
            case 'alt_inline_attach':
                $result .= $this->headerLine('Content-Type', 'multipart/mixed;');
                $result .= $this->textLine("\tboundary=\"" . $this->boundary[1] . '"');
                break;
            case 'alt':
            case 'alt_inline':
                $result .= $this->headerLine('Content-Type', 'multipart/alternative;');
                $result .= $this->textLine("\tboundary=\"" . $this->boundary[1] . '"');
                break;
            default:
                // Catches case 'plain': and case '':
                $result .= $this->textLine('Content-Type: ' . $this->ContentType . '; charset=' . $this->CharSet);
                $ismultipart = false;
                break;
        }
        // RFC1341 part 5 says 7bit is assumed if not specified
        if ('7bit' != $this->Encoding) {
            // RFC 2045 section 6.4 says multipart MIME parts may only use 7bit, 8bit or binary CTE
            if ($ismultipart) {
                if ('8bit' == $this->Encoding) {
                    $result .= $this->headerLine('Content-Transfer-Encoding', '8bit');
                }
                // The only remaining alternatives are quoted-printable and base64, which are both 7bit compatible
            } else {
                $result .= $this->headerLine('Content-Transfer-Encoding', $this->Encoding);
            }
        }

        if ('mail' != $this->Mailer) {
            $result .= static::$LE;
        }

        return $result;
    }

    /**
     * Returns the whole MIME message.
     * Includes complete headers and body.
     * Only valid post preSend().
     *
     * @see    PHPMailer::preSend()
     * @return string
     */
    public function getSentMIMEMessage()
    {
        return rtrim($this->MIMEHeader . $this->mailHeader, "\n\r") . static::$LE . static::$LE . $this->MIMEBody;
    }

    /**
     * Create a unique ID to use for boundaries.
     *
     * @return string
     */
    protected function generateId()
    {
        $len = 23;
        if (function_exists("random_bytes")) {
            $bytes = random_bytes($len);
        } elseif (function_exists("openssl_random_pseudo_bytes")) {
            $bytes = openssl_random_pseudo_bytes($len);
        } else {
            $bytes = uniqid((string)mt_rand(), true);
        }
        return hash('sha256', $bytes);
    }

    /**
     * Assemble the message body.
     * Returns an empty string on failure.
     *
     * @throws Exception
     * @return string The assembled message body
     */
    public function createBody()
    {
        $body = '';
        //Create unique IDs and preset boundaries
        $this->uniqueid = $this->generateId();
        $this->boundary[1] = 'b1_' . $this->uniqueid;
        $this->boundary[2] = 'b2_' . $this->uniqueid;
        $this->boundary[3] = 'b3_' . $this->uniqueid;

        if ($this->sign_key_file) {
            $body .= $this->getMailMIME() . static::$LE;
        }

        $this->setWordWrap();

        $bodyEncoding = $this->Encoding;
        $bodyCharSet = $this->CharSet;
        //Can we do a 7-bit downgrade?
        if ('8bit' == $bodyEncoding and !$this->has8bitChars($this->Body)) {
            $bodyEncoding = '7bit';
            //All ISO 8859, Windows codepage and UTF-8 charsets are ascii compatible up to 7-bit
            $bodyCharSet = 'us-ascii';
        }
        //If lines are too long, and we're not already using an encoding that will shorten them,
        //change to quoted-printable transfer encoding for the body part only
        if ('base64' != $this->Encoding and static::hasLineLongerThanMax($this->Body)) {
            $bodyEncoding = 'quoted-printable';
        }

        $altBodyEncoding = $this->Encoding;
        $altBodyCharSet = $this->CharSet;
        //Can we do a 7-bit downgrade?
        if ('8bit' == $altBodyEncoding and !$this->has8bitChars($this->AltBody)) {
            $altBodyEncoding = '7bit';
            //All ISO 8859, Windows codepage and UTF-8 charsets are ascii compatible up to 7-bit
            $altBodyCharSet = 'us-ascii';
        }
        //If lines are too long, and we're not already using an encoding that will shorten them,
        //change to quoted-printable transfer encoding for the alt body part only
        if ('base64' != $altBodyEncoding and static::hasLineLongerThanMax($this->AltBody)) {
            $altBodyEncoding = 'quoted-printable';
        }
        //Use this as a preamble in all multipart message types
        $mimepre = "This is a multi-part message in MIME format." . static::$LE;
        switch ($this->message_type) {
            case 'inline':
                $body .= $mimepre;
                $body .= $this->getBoundary($this->boundary[1], $bodyCharSet, '', $bodyEncoding);
                $body .= $this->encodeString($this->Body, $bodyEncoding);
                $body .= static::$LE;
                $body .= $this->attachAll('inline', $this->boundary[1]);
                break;
            case 'attach':
                $body .= $mimepre;
                $body .= $this->getBoundary($this->boundary[1], $bodyCharSet, '', $bodyEncoding);
                $body .= $this->encodeString($this->Body, $bodyEncoding);
                $body .= static::$LE;
                $body .= $this->attachAll('attachment', $this->boundary[1]);
                break;
            case 'inline_attach':
                $body .= $mimepre;
                $body .= $this->textLine('--' . $this->boundary[1]);
                $body .= $this->headerLine('Content-Type', 'multipart/related;');
                $body .= $this->textLine("\tboundary=\"" . $this->boundary[2] . '"');
                $body .= static::$LE;
                $body .= $this->getBoundary($this->boundary[2], $bodyCharSet, '', $bodyEncoding);
                $body .= $this->encodeString($this->Body, $bodyEncoding);
                $body .= static::$LE;
                $body .= $this->attachAll('inline', $this->boundary[2]);
                $body .= static::$LE;
                $body .= $this->attachAll('attachment', $this->boundary[1]);
                break;
            case 'alt':
                $body .= $mimepre;
                $body .= $this->getBoundary($this->boundary[1], $altBodyCharSet, 'text/plain', $altBodyEncoding);
                $body .= $this->encodeString($this->AltBody, $altBodyEncoding);
                $body .= static::$LE;
                $body .= $this->getBoundary($this->boundary[1], $bodyCharSet, 'text/html', $bodyEncoding);
                $body .= $this->encodeString($this->Body, $bodyEncoding);
                $body .= static::$LE;
                if (!empty($this->Ical)) {
                    $body .= $this->getBoundary($this->boundary[1], '', 'text/calendar; method=REQUEST', '');
                    $body .= $this->encodeString($this->Ical, $this->Encoding);
                    $body .= static::$LE;
                }
                $body .= $this->endBoundary($this->boundary[1]);
                break;
            case 'alt_inline':
                $body .= $mimepre;
                $body .= $this->getBoundary($this->boundary[1], $altBodyCharSet, 'text/plain', $altBodyEncoding);
                $body .= $this->encodeString($this->AltBody, $altBodyEncoding);
                $body .= static::$LE;
                $body .= $this->textLine('--' . $this->boundary[1]);
                $body .= $this->headerLine('Content-Type', 'multipart/related;');
                $body .= $this->textLine("\tboundary=\"" . $this->boundary[2] . '"');
                $body .= static::$LE;
                $body .= $this->getBoundary($this->boundary[2], $bodyCharSet, 'text/html', $bodyEncoding);
                $body .= $this->encodeString($this->Body, $bodyEncoding);
                $body .= static::$LE;
                $body .= $this->attachAll('inline', $this->boundary[2]);
                $body .= static::$LE;
                $body .= $this->endBoundary($this->boundary[1]);
                break;
            case 'alt_attach':
                $body .= $mimepre;
                $body .= $this->textLine('--' . $this->boundary[1]);
                $body .= $this->headerLine('Content-Type', 'multipart/alternative;');
                $body .= $this->textLine("\tboundary=\"" . $this->boundary[2] . '"');
                $body .= static::$LE;
                $body .= $this->getBoundary($this->boundary[2], $altBodyCharSet, 'text/plain', $altBodyEncoding);
                $body .= $this->encodeString($this->AltBody, $altBodyEncoding);
                $body .= static::$LE;
                $body .= $this->getBoundary($this->boundary[2], $bodyCharSet, 'text/html', $bodyEncoding);
                $body .= $this->encodeString($this->Body, $bodyEncoding);
                $body .= static::$LE;
                if (!empty($this->Ical)) {
                    $body .= $this->getBoundary($this->boundary[2], '', 'text/calendar; method=REQUEST', '');
                    $body .= $this->encodeString($this->Ical, $this->Encoding);
                }
                $body .= $this->endBoundary($this->boundary[2]);
                $body .= static::$LE;
                $body .= $this->attachAll('attachment', $this->boundary[1]);
                break;
            case 'alt_inline_attach':
                $body .= $mimepre;
                $body .= $this->textLine('--' . $this->boundary[1]);
                $body .= $this->headerLine('Content-Type', 'multipart/alternative;');
                $body .= $this->textLine("\tboundary=\"" . $this->boundary[2] . '"');
                $body .= static::$LE;
                $body .= $this->getBoundary($this->boundary[2], $altBodyCharSet, 'text/plain', $altBodyEncoding);
                $body .= $this->encodeString($this->AltBody, $altBodyEncoding);
                $body .= static::$LE;
                $body .= $this->textLine('--' . $this->boundary[2]);
                $body .= $this->headerLine('Content-Type', 'multipart/related;');
                $body .= $this->textLine("\tboundary=\"" . $this->boundary[3] . '"');
                $body .= static::$LE;
                $body .= $this->getBoundary($this->boundary[3], $bodyCharSet, 'text/html', $bodyEncoding);
                $body .= $this->encodeString($this->Body, $bodyEncoding);
                $body .= static::$LE;
                $body .= $this->attachAll('inline', $this->boundary[3]);
                $body .= static::$LE;
                $body .= $this->endBoundary($this->boundary[2]);
                $body .= static::$LE;
                $body .= $this->attachAll('attachment', $this->boundary[1]);
                break;
            default:
                // Catch case 'plain' and case '', applies to simple `text/plain` and `text/html` body content types
                //Reset the `Encoding` property in case we changed it for line length reasons
                $this->Encoding = $bodyEncoding;
                $body .= $this->encodeString($this->Body, $this->Encoding);
                break;
        }

        if ($this->isError()) {
            $body = '';
            if ($this->exceptions) {
                throw new Exception($this->lang('empty_message'), self::STOP_CRITICAL);
            }
        } elseif ($this->sign_key_file) {
            try {
                if (!defined('PKCS7_TEXT')) {
                    throw new Exception($this->lang('extension_missing') . 'openssl');
                }
                // @TODO would be nice to use php://temp streams here
                $file = tempnam(sys_get_temp_dir(), 'mail');
                if (false === file_put_contents($file, $body)) {
                    throw new Exception($this->lang('signing') . ' Could not write temp file');
                }
                $signed = tempnam(sys_get_temp_dir(), 'signed');
                //Workaround for PHP bug https://bugs.php.net/bug.php?id=69197
                if (empty($this->sign_extracerts_file)) {
                    $sign = @openssl_pkcs7_sign(
                        $file,
                        $signed,
                        'file://' . realpath($this->sign_cert_file),
                        ['file://' . realpath($this->sign_key_file), $this->sign_key_pass],
                        []
                    );
                } else {
                    $sign = @openssl_pkcs7_sign(
                        $file,
                        $signed,
                        'file://' . realpath($this->sign_cert_file),
                        ['file://' . realpath($this->sign_key_file), $this->sign_key_pass],
                        [],
                        PKCS7_DETACHED,
                        $this->sign_extracerts_file
                    );
                }
                @unlink($file);
                if ($sign) {
                    $body = file_get_contents($signed);
                    @unlink($signed);
                    //The message returned by openssl contains both headers and body, so need to split them up
                    $parts = explode("\n\n", $body, 2);
                    $this->MIMEHeader .= $parts[0] . static::$LE . static::$LE;
                    $body = $parts[1];
                } else {
                    @unlink($signed);
                    throw new Exception($this->lang('signing') . openssl_error_string());
                }
            } catch (Exception $exc) {
                $body = '';
                if ($this->exceptions) {
                    throw $exc;
                }
            }
        }
        return $body;
    }

    /**
     * Return the start of a message boundary.
     *
     * @param string $boundary
     * @param string $charSet
     * @param string $contentType
     * @param string $encoding
     *
     * @return string
     */
    protected function getBoundary($boundary, $charSet, $contentType, $encoding)
    {
        $result = '';
        if ('' == $charSet) {
            $charSet = $this->CharSet;
        }
        if ('' == $contentType) {
            $contentType = $this->ContentType;
        }
        if ('' == $encoding) {
            $encoding = $this->Encoding;
        }
        $result .= $this->textLine('--' . $boundary);
        $result .= sprintf('Content-Type: %s; charset=%s', $contentType, $charSet);
        $result .= static::$LE;
        // RFC1341 part 5 says 7bit is assumed if not specified
        if ('7bit' != $encoding) {
            $result .= $this->headerLine('Content-Transfer-Encoding', $encoding);
        }
        $result .= static::$LE;

        return $result;
    }

    /**
     * Return the end of a message boundary.
     *
     * @param string $boundary
     *
     * @return string
     */
    protected function endBoundary($boundary)
    {
        return static::$LE . '--' . $boundary . '--' . static::$LE;
    }

    /**
     * Set the message type.
     * PHPMailer only supports some preset message types, not arbitrary MIME structures.
     */
    protected function setMessageType()
    {
        $type = [];
        if ($this->alternativeExists()) {
            $type[] = 'alt';
        }
        if ($this->inlineImageExists()) {
            $type[] = 'inline';
        }
        if ($this->attachmentExists()) {
            $type[] = 'attach';
        }
        $this->message_type = implode('_', $type);
        if ('' == $this->message_type) {
            //The 'plain' message_type refers to the message having a single body element, not that it is plain-text
            $this->message_type = 'plain';
        }
    }

    /**
     * Format a header line.
     *
     * @param string $name
     * @param string|integer $value
     *
     * @return string
     */
    public function headerLine($name, $value)
    {
        return $name . ': ' . $value . static::$LE;
    }

    /**
     * Return a formatted mail line.
     *
     * @param string $value
     *
     * @return string
     */
    public function textLine($value)
    {
        return $value . static::$LE;
    }

    /**
     * Add an attachment from a path on the filesystem.
     * Never use a user-supplied path to a file!
     * Returns false if the file could not be found or read.
     *
     * @param string $path Path to the attachment.
     * @param string $name Overrides the attachment name.
     * @param string $encoding File encoding (see $Encoding).
     * @param string $type File extension (MIME) type.
     * @param string $disposition Disposition to use
     *
     * @throws Exception
     * @return boolean
     */
    public function addAttachment($path, $name = '', $encoding = 'base64', $type = '', $disposition = 'attachment')
    {
        try {
            if (!@is_file($path)) {
                throw new Exception($this->lang('file_access') . $path, self::STOP_CONTINUE);
            }

            // If a MIME type is not specified, try to work it out from the file name
            if ('' == $type) {
                $type = static::filenameToType($path);
            }

            $filename = basename($path);
            if ('' == $name) {
                $name = $filename;
            }

            $this->attachment[] = [
                0 => $path,
                1 => $filename,
                2 => $name,
                3 => $encoding,
                4 => $type,
                5 => false, // isStringAttachment
                6 => $disposition,
                7 => 0
            ];
        } catch (Exception $exc) {
            $this->setError($exc->getMessage());
            $this->edebug($exc->getMessage());
            if ($this->exceptions) {
                throw $exc;
            }
            return false;
        }
        return true;
    }

    /**
     * Return the array of attachments.
     *
     * @return array
     */
    public function getAttachments()
    {
        return $this->attachment;
    }

    /**
     * Attach all file, string, and binary attachments to the message.
     * Returns an empty string on failure.
     *
     * @param string $disposition_type
     * @param string $boundary
     *
     * @return string
     */
    protected function attachAll($disposition_type, $boundary)

This operation has 1538 execution paths which exceeds the configured maximum of 200.

    {
        // Return text of body
        $mime = [];
        $cidUniq = [];
        $incl = [];

        // Add all attachments
        foreach ($this->attachment as $attachment) {
            // Check if it is a valid disposition_filter
            if ($attachment[6] == $disposition_type) {
                // Check for string attachment
                $string = '';
                $path = '';
                $bString = $attachment[5];
                if ($bString) {
                    $string = $attachment[0];
                } else {
                    $path = $attachment[0];
                }

                $inclhash = hash('sha256', serialize($attachment));
                if (in_array($inclhash, $incl)) {
                    continue;
                }
                $incl[] = $inclhash;
                $name = $attachment[2];
                $encoding = $attachment[3];
                $type = $attachment[4];
                $disposition = $attachment[6];
                $cid = $attachment[7];
                if ('inline' == $disposition and array_key_exists($cid, $cidUniq)) {
                    continue;
                }
                $cidUniq[$cid] = true;

                $mime[] = sprintf('--%s%s', $boundary, static::$LE);
                //Only include a filename property if we have one
                if (!empty($name)) {
                    $mime[] = sprintf(
                        'Content-Type: %s; name="%s"%s',
                        $type,
                        $this->encodeHeader($this->secureHeader($name)),
                        static::$LE
                    );
                } else {
                    $mime[] = sprintf(
                        'Content-Type: %s%s',
                        $type,
                        static::$LE
                    );
                }
                // RFC1341 part 5 says 7bit is assumed if not specified
                if ('7bit' != $encoding) {
                    $mime[] = sprintf('Content-Transfer-Encoding: %s%s', $encoding, static::$LE);
                }

                if ('inline' == $disposition) {
                    $mime[] = sprintf('Content-ID: <%s>%s', $cid, static::$LE);
                }

                // If a filename contains any of these chars, it should be quoted,
                // but not otherwise: RFC2183 & RFC2045 5.1
                // Fixes a warning in IETF's msglint MIME checker
                // Allow for bypassing the Content-Disposition header totally
                if (!(empty($disposition))) {
                    $encoded_name = $this->encodeHeader($this->secureHeader($name));
                    if (preg_match('/[ \(\)<>@,;:\\"\/\[\]\?=]/', $encoded_name)) {
                        $mime[] = sprintf(
                            'Content-Disposition: %s; filename="%s"%s',
                            $disposition,
                            $encoded_name,
                            static::$LE . static::$LE
                        );
                    } else {
                        if (!empty($encoded_name)) {
                            $mime[] = sprintf(
                                'Content-Disposition: %s; filename=%s%s',
                                $disposition,
                                $encoded_name,
                                static::$LE . static::$LE
                            );
                        } else {
                            $mime[] = sprintf(
                                'Content-Disposition: %s%s',
                                $disposition,
                                static::$LE . static::$LE
                            );
                        }
                    }
                } else {
                    $mime[] = static::$LE;
                }

                // Encode as string attachment
                if ($bString) {
                    $mime[] = $this->encodeString($string, $encoding);
                } else {
                    $mime[] = $this->encodeFile($path, $encoding);
                }
                if ($this->isError()) {
                    return '';
                }
                $mime[] = static::$LE;
            }
        }

        $mime[] = sprintf('--%s--%s', $boundary, static::$LE);

        return implode('', $mime);
    }

    /**
     * Encode a file attachment in requested format.
     * Returns an empty string on failure.
     *
     * @param string $path The full path to the file
     * @param string $encoding The encoding to use; one of 'base64', '7bit', '8bit', 'binary', 'quoted-printable'
     *
     * @throws Exception
     * @return string
     */
    protected function encodeFile($path, $encoding = 'base64')
    {
        try {
            if (!file_exists($path)) {
                throw new Exception($this->lang('file_open') . $path, self::STOP_CONTINUE);
            }
            $file_buffer = file_get_contents($path);
            if (false === $file_buffer) {
                throw new Exception($this->lang('file_open') . $path, self::STOP_CONTINUE);
            }
            $file_buffer = $this->encodeString($file_buffer, $encoding);
            return $file_buffer;
        } catch (Exception $exc) {
            $this->setError($exc->getMessage());
            return '';
        }
    }

    /**
     * Encode a string in requested format.
     * Returns an empty string on failure.
     *
     * @param string $str The text to encode
     * @param string $encoding The encoding to use; one of 'base64', '7bit', '8bit', 'binary', 'quoted-printable
     *
     * @return string
     */
    public function encodeString($str, $encoding = 'base64')
    {
        $encoded = '';
        switch (strtolower($encoding)) {
            case 'base64':
                $encoded = chunk_split(
                    base64_encode($str),
                    static::STD_LINE_LENGTH - strlen(static::$LE),
                    static::$LE
                );
                break;
            case '7bit':
            case '8bit':
                $encoded = static::normalizeBreaks($str);
                // Make sure it ends with a line break
                if (substr($encoded, -(strlen(static::$LE))) != static::$LE) {
                    $encoded .= static::$LE;
                }
                break;
            case 'binary':
                $encoded = $str;
                break;
            case 'quoted-printable':
                $encoded = $this->encodeQP($str);
                break;
            default:
                $this->setError($this->lang('encoding') . $encoding);
                break;
        }
        return $encoded;
    }

    /**
     * Encode a header value (not including its label) optimally.
     * Picks shortest of Q, B, or none. Result includes folding if needed.
     *
     * @param string $str The header value to encode.
     * @param string $position What context the string will be used in.
     * See RFC822 definitions for phrase, comment and text.
     *
     * @return string
     */
    public function encodeHeader($str, $position = 'text')

This operation has 210 execution paths which exceeds the configured maximum of 200.

    {
        $matchcount = 0;
        switch (strtolower($position)) {
            case 'phrase':
                if (!preg_match('/[\200-\377]/', $str)) {
                    // Can't use addslashes as we don't know the value of magic_quotes_sybase
                    $encoded = addcslashes($str, "\0..\37\177\\\"");
                    if (($str == $encoded) and !preg_match('/[^A-Za-z0-9!#$%&\'*+\/=?^_`{|}~ -]/', $str)) {
                        return $encoded;
                    } else {
                        return "\"$encoded\"";
                    }
                }
                $matchcount = preg_match_all('/[^\040\041\043-\133\135-\176]/', $str, $matches);
                break;
            /** @noinspection PhpMissingBreakStatementInspection */
            case 'comment':
                $matchcount = preg_match_all('/[()"]/', $str, $matches);
                //fallthrough
            case 'text':
            default:
                $matchcount += preg_match_all('/[\000-\010\013\014\016-\037\177-\377]/', $str, $matches);
                break;
        }

        //RFCs specify a maximum line length of 78 chars, however mail() will sometimes
        //corrupt messages with headers longer than 65 chars. See #818
        $lengthsub = 'mail' == $this->Mailer ? 13: 0;
        $maxlen = static::STD_LINE_LENGTH - $lengthsub;
        // Try to select the encoding which should produce the shortest output
        if ($matchcount > strlen($str) / 3) {
            // More than a third of the content will need encoding, so B encoding will be most efficient
            $encoding = 'B';
            //This calculation is:
            // max line length
            // - shorten to avoid mail() corruption
            // - Q/B encoding char overhead ("` =?<charset>?[QB]?<content>?=`")
            // - charset name length
            $maxlen = static::STD_LINE_LENGTH - $lengthsub - 8 - strlen($this->CharSet);
            if ($this->hasMultiBytes($str)) {
                // Use a custom function which correctly encodes and wraps long
                // multibyte strings without breaking lines within a character
                $encoded = $this->base64EncodeWrapMB($str, "\n");
            } else {
                $encoded = base64_encode($str);
                $maxlen -= $maxlen % 4;
                $encoded = trim(chunk_split($encoded, $maxlen, "\n"));
            }
            $encoded = preg_replace('/^(.*)$/m', ' =?' . $this->CharSet . "?$encoding?\\1?=", $encoded);
        } elseif ($matchcount > 0) {
            //1 or more chars need encoding, use Q-encode
            $encoding = 'Q';
            //Recalc max line length for Q encoding - see comments on B encode
            $maxlen = static::STD_LINE_LENGTH - $lengthsub - 8 - strlen($this->CharSet);
            $encoded = $this->encodeQ($str, $position);
            $encoded = $this->wrapText($encoded, $maxlen, true);
            $encoded = str_replace('=' . static::$LE, "\n", trim($encoded));
            $encoded = preg_replace('/^(.*)$/m', ' =?' . $this->CharSet . "?$encoding?\\1?=", $encoded);
        } elseif (strlen($str) > $maxlen) {
            //No chars need encoding, but line is too long, so fold it
            $encoded = trim($this->wrapText($str, $maxlen, false));
            if ($str == $encoded) {
                //Wrapping nicely didn't work, wrap hard instead
                $encoded = trim(chunk_split($str, static::STD_LINE_LENGTH, static::$LE));
            }
            $encoded = str_replace(static::$LE, "\n", trim($encoded));
            $encoded = preg_replace('/^(.*)$/m', ' \\1', $encoded);
        } else {
            //No reformatting needed
            return $str;
        }

        return trim(static::normalizeBreaks($encoded));
    }

    /**
     * Check if a string contains multi-byte characters.
     *
     * @param string $str multi-byte text to wrap encode
     *
     * @return boolean
     */
    public function hasMultiBytes($str)
    {
        if (function_exists('mb_strlen')) {
            return strlen($str) > mb_strlen($str, $this->CharSet);
        } else { // Assume no multibytes (we can't handle without mbstring functions anyway)
            return false;
        }
    }

    /**
     * Does a string contain any 8-bit chars (in any charset)?
     *
     * @param string $text
     *
     * @return boolean
     */
    public function has8bitChars($text)
    {
        return (boolean)preg_match('/[\x80-\xFF]/', $text);
    }

    /**
     * Encode and wrap long multibyte strings for mail headers
     * without breaking lines within a character.
     * Adapted from a function by paravoid
     *
     * @param string $str multi-byte text to wrap encode
     * @param string $linebreak string to use as linefeed/end-of-line
     *
     * @return string
     * @see    http://www.php.net/manual/en/function.mb-encode-mimeheader.php#60283
     */
    public function base64EncodeWrapMB($str, $linebreak = null)
    {
        $start = '=?' . $this->CharSet . '?B?';
        $end = '?=';
        $encoded = '';
        if (is_null($linebreak)) {
            $linebreak = static::$LE;
        }

        $mb_length = mb_strlen($str, $this->CharSet);
        // Each line must have length <= 75, including $start and $end
        $length = 75 - strlen($start) - strlen($end);
        // Average multi-byte ratio
        $ratio = $mb_length / strlen($str);
        // Base64 has a 4:3 ratio
        $avgLength = floor($length * $ratio * .75);

        for ($i = 0; $i < $mb_length; $i += $offset) {
            $lookBack = 0;
            do {
                $offset = $avgLength - $lookBack;
                $chunk = mb_substr($str, $i, $offset, $this->CharSet);
                $chunk = base64_encode($chunk);
                ++$lookBack;
            } while (strlen($chunk) > $length);
            $encoded .= $chunk . $linebreak;
        }

        // Chomp the last linefeed
        $encoded = substr($encoded, 0, -strlen($linebreak));
        return $encoded;
    }

    /**
     * Encode a string in quoted-printable format.
     * According to RFC2045 section 6.7.
     *
     * @param string $string The text to encode
     *
     * @return string
     */
    public function encodeQP($string)
    {
        return static::normalizeBreaks(quoted_printable_encode($string));
    }

    /**
     * Encode a string using Q encoding.
     *
     * @param string $str the text to encode
     * @param string $position Where the text is going to be used, see the RFC for what that means
     *
     * @return string
     * @see    http://tools.ietf.org/html/rfc2047
     */
    public function encodeQ($str, $position = 'text')
    {
        // There should not be any EOL in the string
        $pattern = '';
        $encoded = str_replace(["\r", "\n"], '', $str);
        switch (strtolower($position)) {
            case 'phrase':
                // RFC 2047 section 5.3
                $pattern = '^A-Za-z0-9!*+\/ -';
                break;
            /**
             * RFC 2047 section 5.2.
             * Build $pattern without including delimiters and []
             */
            /** @noinspection PhpMissingBreakStatementInspection */
            case 'comment':
                 $pattern = '\(\)"';
                /* Intentional fall through */
            case 'text':
            default:
                // RFC 2047 section 5.1
                // Replace every high ascii, control, =, ? and _ characters
                $pattern = '\000-\011\013\014\016-\037\075\077\137\177-\377' . $pattern;
                break;
        }
        $matches = [];
        if (preg_match_all("/[{$pattern}]/", $encoded, $matches)) {
            // If the string contains an '=', make sure it's the first thing we replace
            // so as to avoid double-encoding
            $eqkey = array_search('=', $matches[0]);
            if (false !== $eqkey) {
                unset($matches[0][$eqkey]);
                array_unshift($matches[0], '=');
            }
            foreach (array_unique($matches[0]) as $char) {
                $encoded = str_replace($char, '=' . sprintf('%02X', ord($char)), $encoded);
            }
        }
        // Replace spaces with _ (more readable than =20)
        // RFC 2047 section 4.2(2)
        return str_replace(' ', '_', $encoded);
    }

    /**
     * Add a string or binary attachment (non-filesystem).
     * This method can be used to attach ascii or binary data,
     * such as a BLOB record from a database.
     *
     * @param string $string String attachment data.
     * @param string $filename Name of the attachment.
     * @param string $encoding File encoding (see $Encoding).
     * @param string $type File extension (MIME) type.
     * @param string $disposition Disposition to use
     */
    public function addStringAttachment(
        $string,
        $filename,
        $encoding = 'base64',
        $type = '',
        $disposition = 'attachment'
    ) {
        // If a MIME type is not specified, try to work it out from the file name
        if ('' == $type) {
            $type = static::filenameToType($filename);
        }
        // Append to $attachment array
        $this->attachment[] = [
            0 => $string,
            1 => $filename,
            2 => basename($filename),
            3 => $encoding,
            4 => $type,
            5 => true, // isStringAttachment
            6 => $disposition,
            7 => 0
        ];
    }

    /**
     * Add an embedded (inline) attachment from a file.
     * This can include images, sounds, and just about any other document type.
     * These differ from 'regular' attachments in that they are intended to be
     * displayed inline with the message, not just attached for download.
     * This is used in HTML messages that embed the images
     * the HTML refers to using the $cid value.
     * Never use a user-supplied path to a file!
     *
     * @param string $path Path to the attachment.
     * @param string $cid Content ID of the attachment; Use this to reference
     *        the content when using an embedded image in HTML.
     * @param string $name Overrides the attachment name.
     * @param string $encoding File encoding (see $Encoding).
     * @param string $type File MIME type.
     * @param string $disposition Disposition to use
     *
     * @return boolean True on successfully adding an attachment
     */
    public function addEmbeddedImage($path, $cid, $name = '', $encoding = 'base64', $type = '', $disposition = 'inline')
    {
        if (!@is_file($path)) {
            $this->setError($this->lang('file_access') . $path);
            return false;
        }

        // If a MIME type is not specified, try to work it out from the file name
        if ('' == $type) {
            $type = static::filenameToType($path);
        }

        $filename = basename($path);
        if ('' == $name) {
            $name = $filename;
        }

        // Append to $attachment array
        $this->attachment[] = [
            0 => $path,
            1 => $filename,
            2 => $name,
            3 => $encoding,
            4 => $type,
            5 => false, // isStringAttachment
            6 => $disposition,
            7 => $cid
        ];
        return true;
    }

    /**
     * Add an embedded stringified attachment.
     * This can include images, sounds, and just about any other document type.
     * Be sure to set the $type to an image type for images:
     * JPEG images use 'image/jpeg', GIF uses 'image/gif', PNG uses 'image/png'.
     *
     * @param string $string The attachment binary data.
     * @param string $cid Content ID of the attachment; Use this to reference
     *        the content when using an embedded image in HTML.
     * @param string $name
     * @param string $encoding File encoding (see $Encoding).
     * @param string $type MIME type.
     * @param string $disposition Disposition to use
     *
     * @return boolean True on successfully adding an attachment
     */
    public function addStringEmbeddedImage(
        $string,
        $cid,
        $name = '',
        $encoding = 'base64',
        $type = '',
        $disposition = 'inline'
    ) {
        // If a MIME type is not specified, try to work it out from the name
        if ('' == $type and !empty($name)) {
            $type = static::filenameToType($name);
        }

        // Append to $attachment array
        $this->attachment[] = [
            0 => $string,
            1 => $name,
            2 => $name,
            3 => $encoding,
            4 => $type,
            5 => true, // isStringAttachment
            6 => $disposition,
            7 => $cid
        ];
        return true;
    }

    /**
     * Check if an embedded attachment is present with this cid.
     *
     * @param string $cid
     *
     * @return boolean
     */
    protected function cidExists($cid)
    {
        foreach ($this->attachment as $attachment) {
            if ('inline' == $attachment[6] and $cid == $attachment[7]) {
                return true;
            }
        }
        return false;
    }

    /**
     * Check if an inline attachment is present.
     *
     * @return boolean
     */
    public function inlineImageExists()
    {
        foreach ($this->attachment as $attachment) {
            if ($attachment[6] == 'inline') {
                return true;
            }
        }
        return false;
    }

    /**
     * Check if an attachment (non-inline) is present.
     *
     * @return boolean
     */
    public function attachmentExists()
    {
        foreach ($this->attachment as $attachment) {
            if ($attachment[6] == 'attachment') {
                return true;
            }
        }
        return false;
    }

    /**
     * Check if this message has an alternative body set.
     *
     * @return boolean
     */
    public function alternativeExists()
    {
        return !empty($this->AltBody);
    }

    /**
     * Clear queued addresses of given kind.
     *
     * @param string $kind 'to', 'cc', or 'bcc'
     */
    public function clearQueuedAddresses($kind)
    {
        $this->RecipientsQueue = array_filter(
            $this->RecipientsQueue,
            function ($params) use ($kind) {
                return $params[0] != $kind;
            }
        );
    }

    /**
     * Clear all To recipients.
     */
    public function clearAddresses()
    {
        foreach ($this->to as $to) {
            unset($this->all_recipients[strtolower($to[0])]);
        }
        $this->to = [];
        $this->clearQueuedAddresses('to');
    }

    /**
     * Clear all CC recipients.
     */
    public function clearCCs()
    {
        foreach ($this->cc as $cc) {
            unset($this->all_recipients[strtolower($cc[0])]);
        }
        $this->cc = [];
        $this->clearQueuedAddresses('cc');
    }

    /**
     * Clear all BCC recipients.
     */
    public function clearBCCs()
    {
        foreach ($this->bcc as $bcc) {
            unset($this->all_recipients[strtolower($bcc[0])]);
        }
        $this->bcc = [];
        $this->clearQueuedAddresses('bcc');
    }

    /**
     * Clear all ReplyTo recipients.
     */
    public function clearReplyTos()
    {
        $this->ReplyTo = [];
        $this->ReplyToQueue = [];
    }

    /**
     * Clear all recipient types.
     */
    public function clearAllRecipients()
    {
        $this->to = [];
        $this->cc = [];
        $this->bcc = [];
        $this->all_recipients = [];
        $this->RecipientsQueue = [];
    }

    /**
     * Clear all filesystem, string, and binary attachments.
     */
    public function clearAttachments()
    {
        $this->attachment = [];
    }

    /**
     * Clear all custom headers.
     */
    public function clearCustomHeaders()
    {
        $this->CustomHeader = [];
    }

    /**
     * Add an error message to the error container.
     *
     * @param string $msg
     */
    protected function setError($msg)
    {
        ++$this->error_count;
        if ('smtp' == $this->Mailer and !is_null($this->smtp)) {
            $lasterror = $this->smtp->getError();
            if (!empty($lasterror['error'])) {
                $msg .= $this->lang('smtp_error') . $lasterror['error'];
                if (!empty($lasterror['detail'])) {
                    $msg .= ' Detail: '. $lasterror['detail'];
                }
                if (!empty($lasterror['smtp_code'])) {
                    $msg .= ' SMTP code: ' . $lasterror['smtp_code'];
                }
                if (!empty($lasterror['smtp_code_ex'])) {
                    $msg .= ' Additional SMTP info: ' . $lasterror['smtp_code_ex'];
                }
            }
        }
        $this->ErrorInfo = $msg;
    }

    /**
     * Return an RFC 822 formatted date.
     *
     * @return string
     */
    public static function rfcDate()
    {
        // Set the time zone to whatever the default is to avoid 500 errors
        // Will default to UTC if it's not set properly in php.ini
        date_default_timezone_set(@date_default_timezone_get());
        return date('D, j M Y H:i:s O');
    }

    /**
     * Get the server hostname.
     * Returns 'localhost.localdomain' if unknown.
     *
     * @return string
     */
    protected function serverHostname()

serverHostname uses the super-global variable $_SERVER which is generally not recommended.

    {
        $result = '';
        if (!empty($this->Hostname)) {
            $result = $this->Hostname;
        } elseif (isset($_SERVER) and array_key_exists('SERVER_NAME', $_SERVER)) {
            $result = $_SERVER['SERVER_NAME'];
        } elseif (function_exists('gethostname') and gethostname() !== false) {
            $result = gethostname();
        } elseif (php_uname('n') !== false) {
            $result = php_uname('n');
        }
        if (!static::isValidHost($result)) {
            return 'localhost.localdomain';
        } else {
            return $result;
        }
    }

    /**
     * Validate whether a string contains a valid value to use as a hostname or IP address.
     * IPv6 addresses must include [], e.g. `[::1]`, not just `::1`.
     *
     * @param string $host The host name or IP address to check
     * @return bool
     */
    public static function isValidHost($host)
    {
        //Simple syntax limits
        if (empty($host)
            or !is_string($host)
            or strlen($host) > 256
        ) {
            return false;
        }
        //Looks like a bracketed IPv6 address
        if (trim($host, '[]') != $host) {
            return (boolean)filter_var(trim($host, '[]'), FILTER_VALIDATE_IP, FILTER_FLAG_IPV6);
        }
        //If removing all the dots results in a numeric string, it must be an IPv4 address.
        //Need to check this first because otherwise things like `999.0.0.0` are considered valid host names
        if (is_numeric(str_replace('.', '', $host))) {
            //Is it a valid IPv4 address?
            return (boolean)filter_var($host, FILTER_VALIDATE_IP, FILTER_FLAG_IPV4);
        }
        if (filter_var('http://' . $host, FILTER_VALIDATE_URL, FILTER_FLAG_HOST_REQUIRED)) {
            //Is it a syntactically valid hostname?
            return true;
        }
        return false;
    }

    /**
     * Get an error message in the current language.
     *
     * @param string $key
     *
     * @return string
     */
    protected function lang($key)
    {
        if (count($this->language) < 1) {
            $this->setLanguage('en'); // set the default language
        }

        if (array_key_exists($key, $this->language)) {
            if ('smtp_connect_failed' == $key) {
                //Include a link to troubleshooting docs on SMTP connection failure
                //this is by far the biggest cause of support questions
                //but it's usually not PHPMailer's fault.
                return $this->language[$key] . ' https://github.com/PHPMailer/PHPMailer/wiki/Troubleshooting';
            }
            return $this->language[$key];
        } else {
            //Return the key as a fallback
            return $key;
        }
    }

    /**
     * Check if an error occurred.
     *
     * @return boolean True if an error did occur.
     */
    public function isError()
    {
        return ($this->error_count > 0);
    }

    /**
     * Add a custom header.
     * $name value can be overloaded to contain
     * both header name and value (name:value)
     *
     * @param string $name Custom header name
     * @param string $value Header value
     */
    public function addCustomHeader($name, $value = null)
    {
        if (is_null($value)) {
            // Value passed in as name:value
            $this->CustomHeader[] = explode(':', $name, 2);
        } else {
            $this->CustomHeader[] = [$name, $value];
        }
    }

    /**
     * Returns all custom headers.
     *
     * @return array
     */
    public function getCustomHeaders()
    {
        return $this->CustomHeader;
    }

    /**
     * Create a message body from an HTML string.
     * Automatically inlines images and creates a plain-text version by converting the HTML,
     * overwriting any existing values in Body and AltBody.
     * Do not source $message content from user input!
     * $basedir is prepended when handling relative URLs, e.g. <img src="/images/a.png"> and must not be empty
     * will look for an image file in $basedir/images/a.png and convert it to inline.
     * If you don't provide a $basedir, relative paths will be left untouched (and thus probably break in email)
     * Converts data-uri images into embedded attachments.
     * If you don't want to apply these transformations to your HTML, just set Body and AltBody directly.
     *
     * @access public
     * @param string $message HTML message string
     * @param string $basedir Absolute path to a base directory to prepend to relative paths to images
     * @param boolean|callable $advanced Whether to use the internal HTML to text converter
     *    or your own custom converter @see PHPMailer::html2text()
     * @return string $message The transformed message Body
     *
     * @return string $message
     */
    public function msgHTML($message, $basedir = '', $advanced = false)

This operation has 2168 execution paths which exceeds the configured maximum of 200.

    {
        preg_match_all('/(src|background)=["\'](.*)["\']/Ui', $message, $images);
        if (array_key_exists(2, $images)) {
            if (strlen($basedir) > 1 && substr($basedir, -1) != '/') {
                // Ensure $basedir has a trailing /
                $basedir .= '/';
            }
            foreach ($images[2] as $imgindex => $url) {
                // Convert data URIs into embedded images
                //e.g. "data:image/gif;base64,R0lGODlhAQABAAAAACH5BAEKAAEALAAAAAABAAEAAAICTAEAOw=="
                if (preg_match('#^data:(image/(?:jpe?g|gif|png));?(base64)?,(.+)#', $url, $match)) {
                    if (count($match) == 4 and 'base64' == $match[2]) {
                        $data = base64_decode($match[3]);
                    } elseif ('' == $match[2]) {
                        $data = rawurldecode($match[3]);
                    } else {
                        //Not recognised so leave it alone
                        continue;
                    }
                    //Hash the decoded data, not the URL so that the same data-URI image used in multiple places
                    //will only be embedded once, even if it used a different encoding
                    $cid = hash('sha256', $data) . '@phpmailer.0'; // RFC2392 S 2

                    if (!$this->cidExists($cid)) {
                        $this->addStringEmbeddedImage($data, $cid, 'embed' . $imgindex, 'base64', $match[1]);
                    }
                    $message = str_replace(
                        $images[0][$imgindex],
                        $images[1][$imgindex] . '="cid:' . $cid . '"',
                        $message
                    );
                    continue;
                }
                if (// Only process relative URLs if a basedir is provided (i.e. no absolute local paths)
                    !empty($basedir)
                    // Ignore URLs containing parent dir traversal (..)
                    and (strpos($url, '..') === false)
                    // Do not change urls that are already inline images
                    and substr($url, 0, 4) !== 'cid:'
                    // Do not change absolute URLs, including anonymous protocol
                    and !preg_match('#^[a-z][a-z0-9+.-]*:?//#i', $url)
                ) {
                    $filename = basename($url);
                    $directory = dirname($url);
                    if ('.' == $directory) {
                        $directory = '';
                    }
                    $cid = hash('sha256', $url) . '@phpmailer.0'; // RFC2392 S 2
                    if (strlen($basedir) > 1 and substr($basedir, -1) != '/') {
                        $basedir .= '/';
                    }
                    if (strlen($directory) > 1 and substr($directory, -1) != '/') {
                        $directory .= '/';
                    }
                    if ($this->addEmbeddedImage(
                        $basedir . $directory . $filename,
                        $cid,
                        $filename,
                        'base64',
                        static::_mime_types((string)static::mb_pathinfo($filename, PATHINFO_EXTENSION))
                    )
                    ) {
                        $message = preg_replace(
                            '/' . $images[1][$imgindex] . '=["\']' . preg_quote($url, '/') . '["\']/Ui',
                            $images[1][$imgindex] . '="cid:' . $cid . '"',
                            $message
                        );
                    }
                }
            }
        }
        $this->isHTML(true);
        // Convert all message body line breaks to LE, makes quoted-printable encoding work much better
        $this->Body = static::normalizeBreaks($message);
        $this->AltBody = static::normalizeBreaks($this->html2text($message, $advanced));
        if (!$this->alternativeExists()) {
            $this->AltBody = 'This is an HTML-only message. To view it, activate HTML in your email application.'
                . static::$LE;
        }
        return $this->Body;
    }

    /**
     * Convert an HTML string into plain text.
     * This is used by msgHTML().
     * Note - older versions of this function used a bundled advanced converter
     * which was removed for license reasons in #232.
     * Example usage:
     * <code>
     * // Use default conversion
     * $plain = $mail->html2text($html);
     * // Use your own custom converter
     * $plain = $mail->html2text($html, function($html) {
     *     $converter = new MyHtml2text($html);
     *     return $converter->get_text();
     * });
     * </code>
     *
     * @param string $html The HTML text to convert
     * @param boolean|callable $advanced Any boolean value to use the internal converter,
     *   or provide your own callable for custom conversion.
     *
     * @return string
     */
    public function html2text($html, $advanced = false)
    {
        if (is_callable($advanced)) {
            return call_user_func($advanced, $html);
        }
        return html_entity_decode(
            trim(strip_tags(preg_replace('/<(head|title|style|script)[^>]*>.*?<\/\\1>/si', '', $html))),
            ENT_QUOTES,
            $this->CharSet
        );
    }

    /**
     * Get the MIME type for a file extension.
     *
     * @param string $ext File extension
     *
     * @return string MIME type of file.
     */
    public static function _mime_types($ext = '')
    {
        $mimes = [
            'xl'    => 'application/excel',
            'js'    => 'application/javascript',
            'hqx'   => 'application/mac-binhex40',
            'cpt'   => 'application/mac-compactpro',
            'bin'   => 'application/macbinary',
            'doc'   => 'application/msword',
            'word'  => 'application/msword',
            'xlsx'  => 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
            'xltx'  => 'application/vnd.openxmlformats-officedocument.spreadsheetml.template',
            'potx'  => 'application/vnd.openxmlformats-officedocument.presentationml.template',
            'ppsx'  => 'application/vnd.openxmlformats-officedocument.presentationml.slideshow',
            'pptx'  => 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
            'sldx'  => 'application/vnd.openxmlformats-officedocument.presentationml.slide',
            'docx'  => 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
            'dotx'  => 'application/vnd.openxmlformats-officedocument.wordprocessingml.template',
            'xlam'  => 'application/vnd.ms-excel.addin.macroEnabled.12',
            'xlsb'  => 'application/vnd.ms-excel.sheet.binary.macroEnabled.12',
            'class' => 'application/octet-stream',
            'dll'   => 'application/octet-stream',
            'dms'   => 'application/octet-stream',
            'exe'   => 'application/octet-stream',
            'lha'   => 'application/octet-stream',
            'lzh'   => 'application/octet-stream',
            'psd'   => 'application/octet-stream',
            'sea'   => 'application/octet-stream',
            'so'    => 'application/octet-stream',
            'oda'   => 'application/oda',
            'pdf'   => 'application/pdf',
            'ai'    => 'application/postscript',
            'eps'   => 'application/postscript',
            'ps'    => 'application/postscript',
            'smi'   => 'application/smil',
            'smil'  => 'application/smil',
            'mif'   => 'application/vnd.mif',
            'xls'   => 'application/vnd.ms-excel',
            'ppt'   => 'application/vnd.ms-powerpoint',
            'wbxml' => 'application/vnd.wap.wbxml',
            'wmlc'  => 'application/vnd.wap.wmlc',
            'dcr'   => 'application/x-director',
            'dir'   => 'application/x-director',
            'dxr'   => 'application/x-director',
            'dvi'   => 'application/x-dvi',
            'gtar'  => 'application/x-gtar',
            'php3'  => 'application/x-httpd-php',
            'php4'  => 'application/x-httpd-php',
            'php'   => 'application/x-httpd-php',
            'phtml' => 'application/x-httpd-php',
            'phps'  => 'application/x-httpd-php-source',
            'swf'   => 'application/x-shockwave-flash',
            'sit'   => 'application/x-stuffit',
            'tar'   => 'application/x-tar',
            'tgz'   => 'application/x-tar',
            'xht'   => 'application/xhtml+xml',
            'xhtml' => 'application/xhtml+xml',
            'zip'   => 'application/zip',
            'mid'   => 'audio/midi',
            'midi'  => 'audio/midi',
            'mp2'   => 'audio/mpeg',
            'mp3'   => 'audio/mpeg',
            'mpga'  => 'audio/mpeg',
            'aif'   => 'audio/x-aiff',
            'aifc'  => 'audio/x-aiff',
            'aiff'  => 'audio/x-aiff',
            'ram'   => 'audio/x-pn-realaudio',
            'rm'    => 'audio/x-pn-realaudio',
            'rpm'   => 'audio/x-pn-realaudio-plugin',
            'ra'    => 'audio/x-realaudio',
            'wav'   => 'audio/x-wav',
            'bmp'   => 'image/bmp',
            'gif'   => 'image/gif',
            'jpeg'  => 'image/jpeg',
            'jpe'   => 'image/jpeg',
            'jpg'   => 'image/jpeg',
            'png'   => 'image/png',
            'tiff'  => 'image/tiff',
            'tif'   => 'image/tiff',
            'eml'   => 'message/rfc822',
            'css'   => 'text/css',
            'html'  => 'text/html',
            'htm'   => 'text/html',
            'shtml' => 'text/html',
            'log'   => 'text/plain',
            'text'  => 'text/plain',
            'txt'   => 'text/plain',
            'rtx'   => 'text/richtext',
            'rtf'   => 'text/rtf',
            'vcf'   => 'text/vcard',
            'vcard' => 'text/vcard',
            'ics'   => 'text/calendar',
            'xml'   => 'text/xml',
            'xsl'   => 'text/xml',
            'mpeg'  => 'video/mpeg',
            'mpe'   => 'video/mpeg',
            'mpg'   => 'video/mpeg',
            'mov'   => 'video/quicktime',
            'qt'    => 'video/quicktime',
            'rv'    => 'video/vnd.rn-realvideo',
            'avi'   => 'video/x-msvideo',
            'movie' => 'video/x-sgi-movie'
        ];
        if (array_key_exists(strtolower($ext), $mimes)) {
            return $mimes[strtolower($ext)];
        }
        return 'application/octet-stream';
    }

    /**
     * Map a file name to a MIME type.
     * Defaults to 'application/octet-stream', i.e.. arbitrary binary data.
     *
     * @param string $filename A file name or full path, does not need to exist as a file
     *
     * @return string
     */
    public static function filenameToType($filename)
    {
        // In case the path is a URL, strip any query string before getting extension
        $qpos = strpos($filename, '?');
        if (false !== $qpos) {
            $filename = substr($filename, 0, $qpos);
        }
        $ext = static::mb_pathinfo($filename, PATHINFO_EXTENSION);
        return static::_mime_types($ext);

It seems like $ext defined by static::mb_pathinfo($filename, PATHINFO_EXTENSION) on line 3796 can also be of type array<string,string>; however, PHPMailer\PHPMailer\PHPMailer::_mime_types() does only seem to accept string, maybe add an additional type check?

    }

    /**
     * Multi-byte-safe pathinfo replacement.
     * Drop-in replacement for pathinfo(), but multibyte- and cross-platform-safe
     *
     * @param string $path A filename or path, does not need to exist as a file
     * @param integer|string $options Either a PATHINFO_* constant,
     *      or a string name to return only the specified piece
     *
     * @see    http://www.php.net/manual/en/function.pathinfo.php#107461
     * @return string|array
     */
    public static function mb_pathinfo($path, $options = null)
    {
        $ret = ['dirname' => '', 'basename' => '', 'extension' => '', 'filename' => ''];
        $pathinfo = [];
        if (preg_match('#^(.*?)[\\\\/]*(([^/\\\\]*?)(\.([^\.\\\\/]+?)|))[\\\\/\.]*$#im', $path, $pathinfo)) {
            if (array_key_exists(1, $pathinfo)) {
                $ret['dirname'] = $pathinfo[1];
            }
            if (array_key_exists(2, $pathinfo)) {
                $ret['basename'] = $pathinfo[2];
            }
            if (array_key_exists(5, $pathinfo)) {
                $ret['extension'] = $pathinfo[5];
            }
            if (array_key_exists(3, $pathinfo)) {
                $ret['filename'] = $pathinfo[3];
            }
        }
        switch ($options) {
            case PATHINFO_DIRNAME:
            case 'dirname':
                return $ret['dirname'];
            case PATHINFO_BASENAME:
            case 'basename':
                return $ret['basename'];
            case PATHINFO_EXTENSION:
            case 'extension':
                return $ret['extension'];
            case PATHINFO_FILENAME:
            case 'filename':
                return $ret['filename'];
            default:
                return $ret;
        }
    }

    /**
     * Set or reset instance properties.
     * You should avoid this function - it's more verbose, less efficient, more error-prone and
     * harder to debug than setting properties directly.
     * Usage Example:
     * `$mail->set('SMTPSecure', 'tls');`
     *   is the same as:
     * `$mail->SMTPSecure = 'tls';`
     *
     * @param string $name The property name to set
     * @param mixed $value The value to set the property to
     *
     * @return boolean
     */
    public function set($name, $value = '')
    {
        if (property_exists($this, $name)) {
            $this->$name = $value;
            return true;
        } else {
            $this->setError($this->lang('variable_set') . $name);
            return false;
        }
    }

    /**
     * Strip newlines to prevent header injection.
     *
     * @param string $str
     *
     * @return string
     */
    public function secureHeader($str)
    {
        return trim(str_replace(["\r", "\n"], '', $str));
    }

    /**
     * Normalize line breaks in a string.
     * Converts UNIX LF, Mac CR and Windows CRLF line breaks into a single line break format.
     * Defaults to CRLF (for message bodies) and preserves consecutive breaks.
     *
     * @param string $text
     * @param string $breaktype What kind of line break to use; defaults to static::$LE.
     *
     * @return string
     */
    public static function normalizeBreaks($text, $breaktype = null)
    {
        if (is_null($breaktype)) {
            $breaktype = static::$LE;
        }
        // Normalise to \n
        $text = str_replace(["\r\n", "\r"], "\n", $text);
        // Now convert LE as needed
        if ("\n" !== static::$LE) {
            $text = str_replace("\n", $breaktype, $text);
        }
        return $text;
    }

    /**
     * Return the current line break format string.
     *
     * @return string
     */
    public static function getLE()
    {
        return static::$LE;
    }

    /**
     * Set the line break format string, e.g. "\r\n".
     *
     * @param string $le
     */
    protected static function setLE($le)

Avoid variables with short names like $le. Configured minimum length is 3.

    {
        static::$LE = $le;
    }

    /**
     * Set the public and private key files and password for S/MIME signing.
     *
     * @param string $cert_filename
     * @param string $key_filename
     * @param string $key_pass Password for private key
     * @param string $extracerts_filename Optional path to chain certificate
     */
    public function sign($cert_filename, $key_filename, $key_pass, $extracerts_filename = '')
    {
        $this->sign_cert_file = $cert_filename;
        $this->sign_key_file = $key_filename;
        $this->sign_key_pass = $key_pass;
        $this->sign_extracerts_file = $extracerts_filename;
    }

    /**
     * Quoted-Printable-encode a DKIM header.
     *
     * @param string $txt
     *
     * @return string
     */
    public function DKIM_QP($txt)
    {
        $line = '';
        $len = strlen($txt);
        for ($i = 0; $i < $len; ++$i) {
            $ord = ord($txt[$i]);
            if (((0x21 <= $ord) and ($ord <= 0x3A)) or $ord == 0x3C or ((0x3E <= $ord) and ($ord <= 0x7E))) {
                $line .= $txt[$i];
            } else {
                $line .= '=' . sprintf('%02X', $ord);
            }
        }
        return $line;
    }

    /**
     * Generate a DKIM signature.
     *
     * @param string $signHeader
     *
     * @throws Exception
     * @return string The DKIM signature value
     */
    public function DKIM_Sign($signHeader)
    {
        if (!defined('PKCS7_TEXT')) {
            if ($this->exceptions) {
                throw new Exception($this->lang('extension_missing') . 'openssl');
            }
            return '';
        }
        $privKeyStr = !empty($this->DKIM_private_string) ?
                $this->DKIM_private_string :
                file_get_contents($this->DKIM_private);
        if ('' != $this->DKIM_passphrase) {
            $privKey = openssl_pkey_get_private($privKeyStr, $this->DKIM_passphrase);
        } else {
            $privKey = openssl_pkey_get_private($privKeyStr);
        }
        if (openssl_sign($signHeader, $signature, $privKey, 'sha256WithRSAEncryption')) {
            openssl_pkey_free($privKey);
            return base64_encode($signature);
        }
        openssl_pkey_free($privKey);
        return '';
    }

    /**
     * Generate a DKIM canonicalization header.
     * Uses the 'relaxed' algorithm from RFC6376 section 3.4.2
     *
     * @param string $signHeader Header
     *
     * @return string
     * @see    https://tools.ietf.org/html/rfc6376#section-3.4.2
     */
    public function DKIM_HeaderC($signHeader)
    {
        //Unfold all header continuation lines
        //Also collapses folded whitespace.
        //Note PCRE \s is too broad a definition of whitespace; RFC5322 defines it as [ \t]
        //@see https://tools.ietf.org/html/rfc5322#section-2.2
        //That means this may break if you do something daft like put vertical tabs in your headers.
        $signHeader = preg_replace('/\r\n[ \t]+/', ' ', $signHeader);
        $lines = explode("\r\n", $signHeader);
        foreach ($lines as $key => $line) {
            //If the header is missing a :, skip it as it's invalid
            //This is likely to happen because the explode() above will also split
            //on the trailing LE, leaving an empty line
            if (strpos($line, ':') === false) {
                continue;
            }
            list($heading, $value) = explode(':', $line, 2);
            //Lower-case header name
            $heading = strtolower($heading);
            //Collapse white space within the value
            $value = preg_replace('/[ \t]{2,}/', ' ', $value);
            //RFC6376 is slightly unclear here - it says to delete space at the *end* of each value
            //But then says to delete space before and after the colon.
            //Net result is the same as trimming both ends of the value.
            //by elimination, the same applies to the field name
            $lines[$key] = trim($heading, " \t") . ':' . trim($value, " \t");
        }
        $signHeader = implode(static::$LE, $lines);
        return $signHeader;
    }

    /**
     * Generate a DKIM canonicalization body.
     * Uses the 'simple' algorithm from RFC6376 section 3.4.3
     *
     * @param string $body Message Body
     *
     * @return string
     * @see    https://tools.ietf.org/html/rfc6376#section-3.4.3
     */
    public function DKIM_BodyC($body)
    {
        if (empty($body)) {
            return static::$LE;
        }
        // Normalize line endings
        $body = static::normalizeBreaks($body);
        //Reduce multiple trailing line breaks to a single one
        return rtrim($body, "\r\n") . static::$LE;
    }

    /**
     * Create the DKIM header and body in a new message header.
     *
     * @param string $headers_line Header lines
     * @param string $subject Subject
     * @param string $body Body
     *
     * @return string
     */
    public function DKIM_Add($headers_line, $subject, $body)
    {
        $DKIMsignatureType = 'rsa-sha256'; // Signature & hash algorithms
        $DKIMcanonicalization = 'relaxed/simple'; // Canonicalization of header/body
        $DKIMquery = 'dns/txt'; // Query method
        $DKIMtime = time(); // Signature Timestamp = seconds since 00:00:00 - Jan 1, 1970 (UTC time zone)
        $subject_header = "Subject: $subject";
        $headers = explode(static::$LE, $headers_line);
        $from_header = '';
        $to_header = '';
        $date_header = '';
        $current = '';
        foreach ($headers as $header) {
            if (strpos($header, 'From:') === 0) {
                $from_header = $header;
                $current = 'from_header';
            } elseif (strpos($header, 'To:') === 0) {
                $to_header = $header;
                $current = 'to_header';
            } elseif (strpos($header, 'Date:') === 0) {
                $date_header = $header;
                $current = 'date_header';
            } else {
                if (!empty($$current) and strpos($header, ' =?') === 0) {
                    $$current .= $header;
                } else {
                    $current = '';
                }
            }
        }
        $from = str_replace('|', '=7C', $this->DKIM_QP($from_header));
        $to = str_replace('|', '=7C', $this->DKIM_QP($to_header));
        $date = str_replace('|', '=7C', $this->DKIM_QP($date_header));
        $subject = str_replace(
            '|',
            '=7C',
            $this->DKIM_QP($subject_header)
        ); // Copied header fields (dkim-quoted-printable)
        $body = $this->DKIM_BodyC($body);
        $DKIMlen = strlen($body); // Length of body
        $DKIMb64 = base64_encode(pack('H*', hash('sha256', $body))); // Base64 of packed binary SHA-256 hash of body
        if ('' == $this->DKIM_identity) {
            $ident = '';
        } else {
            $ident = ' i=' . $this->DKIM_identity . ';';
        }
        $dkimhdrs = 'DKIM-Signature: v=1; a=' .
            $DKIMsignatureType . '; q=' .
            $DKIMquery . '; l=' .
            $DKIMlen . '; s=' .
            $this->DKIM_selector .
            ";\r\n" .
            "\tt=" . $DKIMtime . '; c=' . $DKIMcanonicalization . ";\r\n" .
            "\th=From:To:Date:Subject;\r\n" .
            "\td=" . $this->DKIM_domain . ';' . $ident . "\r\n" .
            "\tz=$from\r\n" .
            "\t|$to\r\n" .
            "\t|$date\r\n" .
            "\t|$subject;\r\n" .
            "\tbh=" . $DKIMb64 . ";\r\n" .
            "\tb=";
        $toSign = $this->DKIM_HeaderC(
            $from_header . "\r\n" .
            $to_header . "\r\n" .
            $date_header . "\r\n" .
            $subject_header . "\r\n" .
            $dkimhdrs
        );
        $signed = $this->DKIM_Sign($toSign);
        return static::normalizeBreaks($dkimhdrs . $signed) . static::$LE;
    }

    /**
     * Detect if a string contains a line longer than the maximum line length
     * allowed by RFC 2822 section 2.1.1.
     *
     * @param string $str
     *
     * @return boolean
     */
    public static function hasLineLongerThanMax($str)
    {
        return (boolean)preg_match('/^(.{'.(self::MAX_LINE_LENGTH + strlen(static::$LE)).',})/m', $str);
    }

    /**
     * Allows for public read access to 'to' property.
     *
     * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
     *
     * @return array
     */
    public function getToAddresses()
    {
        return $this->to;
    }

    /**
     * Allows for public read access to 'cc' property.
     *
     * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
     *
     * @return array
     */
    public function getCcAddresses()
    {
        return $this->cc;
    }

    /**
     * Allows for public read access to 'bcc' property.
     *
     * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
     *
     * @return array
     */
    public function getBccAddresses()
    {
        return $this->bcc;
    }

    /**
     * Allows for public read access to 'ReplyTo' property.
     *
     * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
     *
     * @return array
     */
    public function getReplyToAddresses()
    {
        return $this->ReplyTo;
    }

    /**
     * Allows for public read access to 'all_recipients' property.
     *
     * Before the send() call, queued addresses (i.e. with IDN) are not yet included.
     *
     * @return array
     */
    public function getAllRecipientAddresses()
    {
        return $this->all_recipients;
    }

    /**
     * Perform a callback.
     *
     * @param boolean $isSent
     * @param array $to
     * @param array $cc
     * @param array $bcc
     * @param string $subject
     * @param string $body
     * @param string $from
     */
    protected function doCallback($isSent, $to, $cc, $bcc, $subject, $body, $from)

Avoid variables with short names like $cc. Configured minimum length is 3.

    {
        if (!empty($this->action_function) and is_callable($this->action_function)) {
            call_user_func_array($this->action_function, [$isSent, $to, $cc, $bcc, $subject, $body, $from]);
        }
    }

    /**
     * Get the OAuth instance.
     *
     * @return OAuth
     */
    public function getOAuth()
    {
        return $this->oauth;
    }

    /**
     * Set an OAuth instance.
     *
     * @param OAuth $oauth
     */
    public function setOAuth(OAuth $oauth)
    {
        $this->oauth = $oauth;
    }
}