swift php 邮件,尝试使用swift mailer，gmail smtp，php发送邮件

这是我的代码：

require_once 'Swift/lib/swift_required.php';

$transport = Swift_SmtpTransport::newInstance('smtp.gmail.com', 465)

->setUsername('[e-mail]')

->setPassword('pass');

$mailer = Swift_Mailer::newInstance($transport);

$message = Swift_Message::newInstance('Wonderful Subject')

->setFrom(array('[e-mail]' => 'MY NAME'))

->setTo(array('[e-mail]' => 'YOU'))

->setBody('This is the text of the mail send by Swift using SMTP transport.');

//$attachment = Swift_Attachment::newInstance(file_get_contents('path/logo.png'), 'logo.png');

//$message->attach($attachment);

$numSent = $mailer->send($message);

printf("Sent %d messages\n", $numSent);

?>

运行此错误后…

致命错误：/home/sitenyou/public_html/Swift/lib/classes/Swift/Transport/AbstractSmtpTransport.php:406中未捕获的异常“

Swift_TransportException”，消息为“预期的响应代码220，但代码为”，消息为“”

Stack trace:

#0 /home/sitenyou/public_html/Swift/lib/classes/Swift/Transport/AbstractSmtpTransport.php(299): Swift_Transport_AbstractSmtpTransport->_assertResponseCode('', Array)

#1 /home/sitenyou/public_html/Swift/lib/classes/Swift/Transport/AbstractSmtpTransport.php(107): Swift_Transport_AbstractSmtpTransport->_readGreeting()

#2 /home/sitenyou/public_html/Swift/lib/classes/Swift/Mailer.php(74): Swift_Transport_AbstractSmtpTransport->start()

#3 /home/sitenyou/public_html/sgmail.php(16): Swift_Mailer->send(Object(Swift_Message))

#4 {main} thrown in /home/sitenyou/public_html/Swift/lib/classes/Swift/Transport/AbstractSmtpTransport.php on line 406