class.phpmailer.php

    }

    /**
     * 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
     * @return void
     */
    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 == '') {
            $type = self::filenameToType($filename);
        }
        // Append to $attachment array
        $this->attachment[] = array(
            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 = '', $disposition = 'inline')
    {
        if (!self::isPermittedPath($path) or !@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 == '') {
            $type = self::filenameToType($path);
        }

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

        // Append to $attachment array
        $this->attachment[] = array(
            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)) {
            $type = self::filenameToType($name);
        }

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

    /**
     * Check if an inline attachment is present.
     * @access public
     * @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.
     * @access protected
     * @param string $kind 'to', 'cc', or 'bcc'
     * @return void
     */
    public function clearQueuedAddresses($kind)
    {
        $RecipientsQueue = $this->RecipientsQueue;
        foreach ($RecipientsQueue as $address => $params) {
            if ($params[0] == $kind) {
                unset($this->RecipientsQueue[$address]);
            }
        }
    }

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

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

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

    /**
     * Clear all ReplyTo recipients.
     * @return void
     */
    public function clearReplyTos()
    {
        $this->ReplyTo = array();
        $this->ReplyToQueue = array();
    }

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

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

    /**
     * Clear all custom headers.
     * @return void
     */
    public function clearCustomHeaders()
    {
        $this->CustomHeader = array();
    }

    /**
     * Add an error message to the error container.
     * @access protected
     * @param string $msg
     * @return void
     */
    protected function setError($msg)
    {
        $this->error_count++;
        if ($this->Mailer == 'smtp' 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.
     * @access public
     * @return string
     * @static
     */
    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.
     * @access protected
     * @return string
     */
    protected function serverHostname()
    {
        $result = 'localhost.localdomain';
        if (!empty($this->Hostname)) {
            $result = $this->Hostname;
        } elseif (isset($_SERVER) and array_key_exists('SERVER_NAME', $_SERVER) and !empty($_SERVER['SERVER_NAME'])) {
            $result = $_SERVER['SERVER_NAME'];
        } elseif (function_exists('gethostname') && gethostname() !== false) {
            $result = gethostname();
        } elseif (php_uname('n') !== false) {
            $result = php_uname('n');
        }
        return $result;
    }

    /**
     * Get an error message in the current language.
     * @access protected
     * @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, $this->language)) {
            if ($key == 'smtp_connect_failed') {
                //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.
     * @access public
     * @return boolean True if an error did occur.
     */
    public function isError()
    {
        return ($this->error_count > 0);
    }

    /**
     * Ensure consistent line endings in a string.
     * Changes every end of line from CRLF, CR or LF to $this->LE.
     * @access public
     * @param string $str String to fixEOL
     * @return string
     */
    public function fixEOL($str)
    {
        // Normalise to \n
        $nstr = str_replace(array("\r\n", "\r"), "\n", $str);
        // Now convert LE as needed
        if ($this->LE !== "\n") {
            $nstr = str_replace("\n", $this->LE, $nstr);
        }
        return $nstr;
    }

    /**
     * Add a custom header.
     * $name value can be overloaded to contain
     * both header name and value (name:value)
     * @access public
     * @param string $name Custom header name
     * @param string $value Header value
     * @return void
     */
    public function addCustomHeader($name, $value = null)
    {
        if ($value === null) {
            // Value passed in as name:value
            $this->CustomHeader[] = explode(':', $name, 2);
        } else {
            $this->CustomHeader[] = array($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)
     * 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 $message The transformed message Body
     */
    public function msgHTML($message, $basedir = '', $advanced = false)
    {
        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
                if (preg_match('#^data:(image[^;,]*)(;base64)?,#', $url, $match)) {
                    $data = substr($url, strpos($url, ','));
                    if ($match[2]) {
                        $data = base64_decode($data);
                    } else {
                        $data = rawurldecode($data);
                    }
                    $cid = md5($url) . '@phpmailer.0'; // RFC2392 S 2
                    if ($this->addStringEmbeddedImage($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 (..)
                    && (strpos($url, '..') === false)
                    // Do not change urls that are already inline images
                    && substr($url, 0, 4) !== 'cid:'
                    // Do not change absolute URLs, including anonymous protocol
                    && !preg_match('#^[a-z][a-z0-9+.-]*:?//#i', $url)
                ) {
                    $filename = basename($url);
                    $directory = dirname($url);
                    if ($directory == '.') {
                        $directory = '';
                    }
                    $cid = md5($url) . '@phpmailer.0'; // RFC2392 S 2
                    if (strlen($directory) > 1 && substr($directory, -1) != '/') {
                        $directory .= '/';
                    }
                    if ($this->addEmbeddedImage(
                        $basedir . $directory . $filename,
                        $cid,
                        $filename,
                        'base64',
                        self::_mime_types((string)self::mb_pathinfo($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 CRLF, makes quoted-printable encoding work much better
        $this->Body = $this->normalizeBreaks($message);
        $this->AltBody = $this->normalizeBreaks($this->html2text($message, $advanced));
        if (!$this->alternativeExists()) {
            $this->AltBody = 'To view this email message, open it in a program that understands HTML!' .
                self::CRLF . self::CRLF;
        }
        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 been 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 $ext File extension
     * @access public
     * @return string MIME type of file.
     * @static
     */
    public static function _mime_types($ext = '')
    {
        $mimes = array(
            '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',
            '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 $filename A file name or full path, does not need to exist as a file
     * @return string
     * @static
     */
    public static function filenameToType($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);
        }
        $pathinfo = self::mb_pathinfo($filename);
        return self::_mime_types($pathinfo['extension']);
    }

    /**
     * Multi-byte-safe pathinfo replacement.
     * Drop-in replacement for pathinfo(), but multibyte-safe, cross-platform-safe, old-version-safe.
     * Works similarly to the one in PHP >= 5.2.0
     * @link http://www.php.net/manual/en/function.pathinfo.php#107461
     * @param string $path A filename or path, does not need to exist as a file
     * @param integer|string $options Either a PATHINFO_* constant,
     *      or a string name to return only the specified piece, allows 'filename' to work on PHP < 5.2
     * @return string|array
     * @static
     */
    public static function mb_pathinfo($path, $options = null)
    {
        $ret = array('dirname' => '', 'basename' => '', 'extension' => '', 'filename' => '');
        $pathinfo = array();
        if (preg_match('%^(.*?)[\\\\/]*(([^/\\\\]*?)(\.([^\.\\\\/]+?)|))[\\\\/\.]*$%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';`
     * @access public
     * @param string $name The property name to set
     * @param mixed $value The value to set the property to
     * @return boolean
     * @TODO Should this not be using the __set() magic function?
     */
    public function set($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.
     * @access public
     * @param string $str
     * @return string
     */
    public function secureHeader($str)
    {
        return trim(str_replace(array("\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 $breaktype What kind of line break to use, defaults to CRLF
     * @return string
     * @access public
     * @static
     */
    public static function normalizeBreaks($text, $breaktype = "\r\n")
    {
        return preg_replace('/(\r\n|\r|\n)/ms', $breaktype, $text);
    }

    /**
     * Set the public and private key files and password for S/MIME signing.
     * @access public
     * @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.
     * @access public
     * @param string $txt
     * @return string
     */
    public function DKIM_QP($txt)
    {
        $line = '';
        for ($i = 0; $i < strlen($txt); $i++) {
            $ord = ord($txt[$i]);
            if (((0x21 <= $ord) && ($ord <= 0x3A)) || $ord == 0x3C || ((0x3E <= $ord) && ($ord <= 0x7E))) {
                $line .= $txt[$i];
            } else {
                $line .= '=' . sprintf('%02X', $ord);
            }
        }
        return $line;
    }

    /**
     * Generate a DKIM signature.
     * @access public
     * @param string $signHeader
     * @throws phpmailerException
     * @return string The DKIM signature value
     */
    public function DKIM_Sign($signHeader)
    {
        if (!defined('PKCS7_TEXT')) {
            if ($this->exceptions) {
                throw new phpmailerException($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);
        }
        //Workaround for missing digest algorithms in old PHP & OpenSSL versions
        //@link http://stackoverflow.com/a/11117338/333340
        if (version_compare(PHP_VERSION, '5.3.0') >= 0 and
            in_array('sha256WithRSAEncryption', openssl_get_md_methods(true))) {
            if (openssl_sign($signHeader, $signature, $privKey, 'sha256WithRSAEncryption')) {
                openssl_pkey_free($privKey);
                return base64_encode($signature);
            }
        } else {
            $pinfo = openssl_pkey_get_details($privKey);
            $hash = hash('sha256', $signHeader);
            //'Magic' constant for SHA256 from RFC3447
            //@link https://tools.ietf.org/html/rfc3447#page-43
            $t = '3031300d060960864801650304020105000420' . $hash;
            $pslen = $pinfo['bits'] / 8 - (strlen($t) / 2 + 3);
            $eb = pack('H*', '0001' . str_repeat('FF', $pslen) . '00' . $t);

            if (openssl_private_encrypt($eb, $signature, $privKey, OPENSSL_NO_PADDING)) {
                openssl_pkey_free($privKey);
                return base64_encode($signature);
            }
        }
        openssl_pkey_free($privKey);
        return '';
    }

    /**
     * Generate a DKIM canonicalization header.
     * @access public
     * @param string $signHeader Header
     * @return string
     */
    public function DKIM_HeaderC($signHeader)
    {
        $signHeader = preg_replace('/\r\n\s+/', ' ', $signHeader);
        $lines = explode("\r\n", $signHeader);
        foreach ($lines as $key => $line) {
            list($heading, $value) = explode(':', $line, 2);
            $heading = strtolower($heading);
            $value = preg_replace('/\s{2,}/', ' ', $value); // Compress useless spaces
            $lines[$key] = $heading . ':' . trim($value); // Don't forget to remove WSP around the value
        }
        $signHeader = implode("\r\n", $lines);
        return $signHeader;
    }

    /**
     * Generate a DKIM canonicalization body.
     * @access public
     * @param string $body Message Body
     * @return string
     */
    public function DKIM_BodyC($body)
    {
        if ($body == '') {
            return "\r\n";
        }
        // stabilize line endings
        $body = str_replace("\r\n", "\n", $body);
        $body = str_replace("\n", "\r\n", $body);
        // END stabilize line endings
        while (substr($body, strlen($body) - 4, 4) == "\r\n\r\n") {
            $body = substr($body, 0, strlen($body) - 2);
        }
        return $body;
    }

    /**
     * Create the DKIM header and body in a new message header.
     * @access public
     * @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";
        $headers = explode($this->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($$current) && strpos($header, ' =?') === 0) {
                    $$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 $dkimhdrs . $signed . "\r\n";
    }

    /**
     * Detect if a string contains a line longer than the maximum line length allowed.
     * @param string $str
     * @return boolean
     * @static
     */
    public static function hasLineLongerThanMax($str)
    {
        //+2 to include CRLF line break for a 1000 total
        return (boolean)preg_match('/^(.{'.(self::MAX_LINE_LENGTH + 2).',})/m', $str);
    }

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

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

    /**
     * Allows for public read access to 'bcc' property.
     * @note: Before the send() call, queued addresses (i.e. with IDN) are not yet included.
     * @access public
     * @return array