Fatal error: ?Uncaught exception 'Swift_TransportException' with message 'Failed to authenticate on SMTP server with username "34205@qq.com" using 1 possible authenticators' in D:\phpStudy\WWW\app\swiftmailer-master\lib\classes\Swift\Transport\Esmtp\AuthHandler.php:184 Stack trace: #0 D:\phpStudy\WWW\app\swiftmailer-master\lib\classes\Swift\Transport\EsmtpTransport.php(312): Swift_Transport_Esmtp_AuthHandler->afterEhlo(Object(Swift_SmtpTransport)) #1 D:\phpStudy\WWW\app\swiftmailer-master\lib\classes\Swift\Transport\AbstractSmtpTransport.php(120): Swift_Transport_EsmtpTransport->_doHeloCommand() #2 D:\phpStudy\WWW\app\swiftmailer-master\lib\classes\Swift\Mailer.php(80): Swift_Transport_AbstractSmtpTransport->start() #3 D:\phpStudy\WWW\app\doAction.php(53): Swift_Mailer->send(Object(Swift_Message)) #4 {main} ?thrown in D:\phpStudy\WWW\app\swiftmailer-master\lib\classes\Swift\Transport\Esmtp\AuthHandler.php on line 184