voku / swiftmailer

     *

     * @return mixed|null|string

     */

    protected function _getReversePath(Swift_Mime_Message $message)

    {

        $return = $message->getReturnPath();

        $sender = $message->getSender();

        $from = $message->getFrom();

        $path = null;

        if (!empty($return)) {

            $path = $return;

        } elseif (!empty($sender)) {

            // don't use array_keys

            reset($sender); // reset Pointer to first pos

            $path = key($sender); // get key

        } elseif (!empty($from)) {

            reset($from); // reset Pointer to first pos

            $path = key($from); // get key

        }

        return $path;

    }

    /**

     * Throw a TransportException, first sending it to any listeners.

     *

     * @return mixed|null|string

     */

    private function _getReversePath(Swift_Mime_Message $message)

    {

        $return = $message->getReturnPath();

        $sender = $message->getSender();

        $from = $message->getFrom();

        $path = null;

        if (!empty($return)) {

            $path = $return;

        } elseif (!empty($sender)) {

            $keys = array_keys($sender);

            $path = array_shift($keys);

        } elseif (!empty($from)) {

            $keys = array_keys($from);

            $path = array_shift($keys);

        }

        return $path;

    }

    /**

     * Return php mail extra params to use for invoker->mail.