* PHP Version 5

 * @package PHPMailer

 * @link https://github.com/PHPMailer/PHPMailer/ The PHPMailer GitHub project

 * @author Marcus Bointon (Synchro/coolbru) <phpmailer@synchromedia.co.uk>

 * @author Brent R. Matzelle (original founder)

 * @copyright 2014 Marcus Bointon

 * @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.

 * Implements RFC 821 SMTP commands and provides some utility methods for sending mail to an SMTP server.

 * @package PHPMailer

 * @author Chris Ryan

 * @author Marcus Bointon <phpmailer@synchromedia.co.uk>

     * The PHPMailer SMTP version number.

     * @var string

    const VERSION = '5.2.22';

     * @var string

     * @var integer

     * The maximum line length allowed by RFC 2822 section 2.1.1

     * @var integer

     */

    const MAX_LINE_LENGTH = 998;

    /**

     * Debug level for no output

     */

    const DEBUG_OFF = 0;

    /**

     * Debug level to show client -> server messages

     */

    const DEBUG_CLIENT = 1;

    /**

     * Debug level to show client -> server and server -> client messages

     */

    const DEBUG_SERVER = 2;

    /**

     * Debug level to show connection status, client -> server and server -> client messages

     */

    const DEBUG_CONNECTION = 3;

    /**

     * Debug level to show all messages

     */

    const DEBUG_LOWLEVEL = 4;

    /**

     * @var string

     * @deprecated Use the `VERSION` constant instead

    public $Version = '5.2.22';

     * @var integer

     * @deprecated This is only ever used as a default value, so use the `DEFAULT_SMTP_PORT` constant instead

     * SMTP reply line ending.

     * @var string

     * @deprecated Use the `CRLF` constant instead

     * Options:

     * * self::DEBUG_OFF (`0`) No debug output, default

     * * self::DEBUG_CLIENT (`1`) Client commands

     * * self::DEBUG_SERVER (`2`) Client commands and server responses

     * * self::DEBUG_CONNECTION (`3`) As DEBUG_SERVER plus connection status

     * * self::DEBUG_LOWLEVEL (`4`) Low-level data output, all messages

     * @var integer

    public $do_debug = self::DEBUG_OFF;

     * 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

     *

     * Alternatively, you can provide a callable expecting two params: a message string and the debug level:

     * <code>

     * $smtp->Debugoutput = function($str, $level) {echo "debug level $level; message: $str";};

     * </code>

     * @var string|callable

     * @link http://en.wikipedia.org/wiki/Variable_envelope_return_path

     * @link http://www.postfix.org/VERP_README.html Info on VERP

     * @var boolean

     * The timeout value for connection, in seconds.

     * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2

     * This needs to be quite high to function correctly with hosts using greetdelay as an anti-spam measure.

     * @link http://tools.ietf.org/html/rfc2821#section-4.5.3.2

     * @var integer

    public $Timeout = 300;

     * How long to wait for commands to complete, in seconds.

     * Default of 5 minutes (300sec) is from RFC2821 section 4.5.3.2

     * @var integer

    public $Timelimit = 300;

	/**

	 * @var array patterns to extract smtp transaction id from smtp reply

	 * Only first capture group will be use, use non-capturing group to deal with it

	 * Extend this class to override this property to fulfil your needs.

	 */

	protected $smtp_transaction_id_patterns = array(

		'exim' => '/[0-9]{3} OK id=(.*)/',

		'sendmail' => '/[0-9]{3} 2.0.0 (.*) Message/',

		'postfix' => '/[0-9]{3} 2.0.0 Ok: queued as (.*)/'

	);

     * @var resource

     * Error information, if any, for the last SMTP command.

     * @var array

    protected $error = array(

        'error' => '',

        'detail' => '',

        'smtp_code' => '',

        'smtp_code_ex' => ''

    );

     * If null, no HELO string has yet been received.

     * @var string|null

    protected $helo_rply = null;

    /**

     * The set of SMTP extensions sent in reply to EHLO command.

     * Indexes of the array are extension names.

     * Value at index 'HELO' or 'EHLO' (according to command that was sent)

     * represents the server name. In case of HELO it is the only element of the array.

     * Other values can be boolean TRUE or an array containing extension options.

     * If null, no HELO/EHLO string has yet been received.

     * @var array|null

     */

    protected $server_caps = null;

     * @var string

     * @see SMTP::$Debugoutput

     * @see SMTP::$do_debug

     * @param integer $level The debug level of this message; see DEBUG_* constants

    protected function edebug($str, $level = 0)

        if ($level > $this->do_debug) {

            return;

        }

        //Avoid clash with built-in function names

        if (!in_array($this->Debugoutput, array('error_log', 'html', 'echo')) and is_callable($this->Debugoutput)) {

            call_user_func($this->Debugoutput, $str, $level);

            return;

        }

                //Normalize line breaks

                $str = preg_replace('/(\r\n|\r|\n)/ms', "\n", $str);

                echo gmdate('Y-m-d H:i:s') . "\t" . str_replace(

                    "\n",

                    "\n                   \t                  ",

                    trim($str)

                )."\n";

     * @param string $host SMTP server IP or host name

     * @param integer $port The port number to connect to

     * @param integer $timeout How long to wait for the connection to open

     * @return boolean

        static $streamok;

        //This is enabled by default since 5.0.0 but some providers disable it

        //Check this once and cache the result

        if (is_null($streamok)) {

            $streamok = function_exists('stream_socket_client');

        }

        $this->setError('');

            $this->setError('Already connected to a server');

        $this->edebug(

            "Connection: opening to $host:$port, timeout=$timeout, options=".var_export($options, true),

            self::DEBUG_CONNECTION

        );

        if ($streamok) {

            $socket_context = stream_context_create($options);

            set_error_handler(array($this, 'errorHandler'));

            $this->smtp_conn = stream_socket_client(

                $host . ":" . $port,

                $errno,

                $errstr,

                $timeout,

                STREAM_CLIENT_CONNECT,

                $socket_context

            );

            restore_error_handler();

        } else {

            //Fall back to fsockopen which should work in more places, but is missing some features

            $this->edebug(

                "Connection: stream_socket_client not available, falling back to fsockopen",

                self::DEBUG_CONNECTION

            );

            set_error_handler(array($this, 'errorHandler'));

            $this->smtp_conn = fsockopen(

                $host,

                $port,

                $errno,

                $errstr,

                $timeout

            );

            restore_error_handler();

        }

        if (!is_resource($this->smtp_conn)) {

            $this->setError(

                'Failed to connect to server',

                $errno,

                $errstr

            $this->edebug(

                'SMTP ERROR: ' . $this->error['error']

                . ": $errstr ($errno)",

                self::DEBUG_CLIENT

            );

        $this->edebug('Connection: opened', self::DEBUG_CONNECTION);

            // Don't bother if unlimited

            if ($max != 0 && $timeout > $max) {

        $this->edebug('SERVER -> CLIENT: ' . $announce, self::DEBUG_SERVER);

     * @return boolean

        if (!$this->sendCommand('STARTTLS', 'STARTTLS', 220)) {

        //Allow the best TLS version(s) we can

        $crypto_method = STREAM_CRYPTO_METHOD_TLS_CLIENT;

        //PHP 5.6.7 dropped inclusion of TLS 1.1 and 1.2 in STREAM_CRYPTO_METHOD_TLS_CLIENT

        //so add them back in manually if we can

        if (defined('STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT')) {

            $crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_2_CLIENT;

            $crypto_method |= STREAM_CRYPTO_METHOD_TLSv1_1_CLIENT;

        }

            $crypto_method

        )) {

     * @param string $username The user name

     * @param string $password The password

     * @param string $authtype The auth type (PLAIN, LOGIN, CRAM-MD5)

     * @param string $realm The auth realm for NTLM

     * @param null|OAuth $OAuth An optional OAuth instance (@see PHPMailerOAuth)

     * @return bool True if successfully authenticated.* @access public

        $authtype = null,

        $workstation = '',

        $OAuth = null

        if (!$this->server_caps) {

            $this->setError('Authentication is not allowed before HELO/EHLO');

            return false;

        }

        if (array_key_exists('EHLO', $this->server_caps)) {

        // SMTP extensions are available. Let's try to find a proper authentication method

            if (!array_key_exists('AUTH', $this->server_caps)) {

                $this->setError('Authentication is not allowed at this stage');

                // 'at this stage' means that auth may be allowed after the stage changes

                // e.g. after STARTTLS

                return false;

            }

            self::edebug('Auth method requested: ' . ($authtype ? $authtype : 'UNKNOWN'), self::DEBUG_LOWLEVEL);

            self::edebug(

                'Auth methods available on the server: ' . implode(',', $this->server_caps['AUTH']),

                self::DEBUG_LOWLEVEL

            );

            if (empty($authtype)) {

                foreach (array('CRAM-MD5', 'LOGIN', 'PLAIN') as $method) {

                    if (in_array($method, $this->server_caps['AUTH'])) {

                        $authtype = $method;

                        break;

                    }

                }

                if (empty($authtype)) {