if ($res){
        //发送邮件,以QQ邮箱为例
        //配置邮件服务器，得到传输对象
        $transport=Swift_SmtpTransport::newInstance('smtp.qq.com',465);//25是默认端口号
        //设置登录帐号和密码
        $transport->setUsername('893480702@qq.com');//发送方邮箱
        $transport->setPassword($emailPassword);
        //得到发送邮件对象Swift_Mailer对象
        $mailer=Swift_Mailer::newInstance($transport);
        //得到邮件信息对象
        $message=Swift_Message::newInstance();
        //设置管理员的信息
        $message->setFrom(array('893480702@qq.com'=>'Mogu'));
        //将邮件发给谁
        $message->setTo(array($email=>'imooc'));
        ……
        try {
            if ($mailer->send($message)){
                echo "恭喜您{$username}注册成功，请到邮箱激活之后登录";
                echo '3秒钟后跳转到登录页面';
                echo '<meta http-equiv="refresh" content="3;url=index.php#tologin"/>';
            }else{
                $PdoMySql->delete($table,'id='.$lastInsertId);
                echo '注册失败，请重新注册';
                echo '3秒钟后跳转到注册页面';
                echo '<meta http-equiv="refresh" content="3;url=index.php#toregister"/>';
            }
        } catch (Swift_ConnectionException $e) {//这里是警告
            echo '邮件发送错误'.$e->getMessage();
        }

错误是：Fatal error:  Uncaught Swift_TransportException: Connection to smtp.qq.com:465 Timed Out in F:\xampp\htdocs\practise\pdoEx\app\swiftmailer-master\lib\classes\Swift\Transport\AbstractSmtpTransport.php:407 Stack trace: #0 F:\xampp\htdocs\practise\pdoEx\app\swiftmailer-master\lib\classes\Swift\Transport\AbstractSmtpTransport.php(291): Swift_Transport_AbstractSmtpTransport->_getFullResponse(0) #1 F:\xampp\htdocs\practise\pdoEx\app\swiftmailer-master\lib\classes\Swift\Transport\AbstractSmtpTransport.php(119): Swift_Transport_AbstractSmtpTransport->_readGreeting() #2 F:\xampp\htdocs\practise\pdoEx\app\swiftmailer-master\lib\classes\Swift\Mailer.php(80): Swift_Transport_AbstractSmtpTransport->start() #3 F:\xampp\htdocs\practise\pdoEx\app\doAction.php(54): Swift_Mailer->send(Object(Swift_Message)) #4 {main}  thrown in F:\xampp\htdocs\practise\pdoEx\app\swiftmailer-master\lib\classes\Swift\Transport\AbstractSmtpTransport.php on line 407