php发送gmail 使用GMail SMTP服务器从PHP页面发送电子邮件

我试图通过Gmail的SMTP服务器从一个PHP页面发送电子邮件，但是我得到了这个错误:

身份验证失败[SMTP:SMTP服务器不支持身份验证(代码:250，响应: at your service，[98.117.99.235]SIZE 35651584 8Bitmime STARTTLS ENHANCEDSTATUSCODES PIPELINING)]

有人能帮忙吗？ 下面是我的代码:<?php

require_once "Mail.php";

$from = "Sandra Sender ";

$to = "Ramona Recipient ";

$subject = "Hi!";

$body = "Hi,\n\nHow are you?";

$host = "";

$port = "587";

$username = "testtest@";

$password = "testtest";

$headers = array ('From' => $from,

'To' => $to,

'Subject' => $subject);

$smtp = Mail::factory('smtp',

array ('host' => $host,

'port' => $port,

'auth' => true,

'username' => $username,

'password' => $password));

$mail = $smtp->send($to, $headers, $body);

if (PEAR::isError($mail)) {

echo("

" . $mail->getMessage() . "

");

} else {

echo("

Message successfully sent!

");

}

?>

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