egulias / EmailValidator

        $host = $email;

        // Arguable pattern to extract the domain. Not aiming to validate the domain nor the email

        if (false !== $lastAtPos = strrpos($email, '@')) {

            $host = substr($email, $lastAtPos + 1);

        }

        return $this->checkDNS($host);

    }

        $variant = defined('INTL_IDNA_VARIANT_UTS46') ? INTL_IDNA_VARIANT_UTS46 : INTL_IDNA_VARIANT_2003;

        $hostname = $email;

        if ( false !== ($lastAtPos = strrpos($email, '@')) ) {

            $hostname = substr($email, $lastAtPos + 1);

        }

        $hostname = rtrim(idn_to_ascii($hostname, IDNA_DEFAULT, $variant), '.') . '.';

        $mxHosts = [];