Fatal error:  Uncaught exception 'Swift_TransportException' with message 'Failed to authenticate on SMTP server with username "89520****@qq.com" using 1 possible authenticators' in /Applications/MAMP/htdocs/Imooc_PDO/App2/swiftmailer-master/lib/classes/Swift/Transport/Esmtp/AuthHandler.php:184 Stack trace: #0 /Applications/MAMP/htdocs/Imooc_PDO/App2/swiftmailer-master/lib/classes/Swift/Transport/EsmtpTransport.php(312): Swift_Transport_Esmtp_AuthHandler->afterEhlo(Object(Swift_SmtpTransport)) #1 /Applications/MAMP/htdocs/Imooc_PDO/App2/swiftmailer-master/lib/classes/Swift/Transport/AbstractSmtpTransport.php(120): Swift_Transport_EsmtpTransport->_doHeloCommand() #2 /Applications/MAMP/htdocs/Imooc_PDO/App2/swiftmailer-master/lib/classes/Swift/Mailer.php(80): Swift_Transport_AbstractSmtpTransport->start() #3 /Applications/MAMP/htdocs/Imooc_PDO/app2/doAction.php(52): Swift_Mailer->send(Object(Swift_Message)) #4 {main}  thrown in /Applications/MAMP/htdocs/Imooc_PDO/App2/swiftmailer-master/lib/classes/Swift/Transport/Esmtp/AuthHandler.php on line 184