从PHP页面使用GMail SMTP服务器发送电子邮件

Question

从PHP页面使用GMail SMTP服务器发送电子邮件我试图从PHP页面通过GMail的SMTP服务器发送电子邮件，但是我收到此错误：身份验证失败[SMTP：SMTP服务器不支持身份验证（代码：250，响应：mx.google.com为您服务，[98.117.99.235] SIZE 35651584 8BITMIME STARTTLS ENHANCEDSTATUSCODES PIPELINING）]有人可以帮忙吗？这是我的代码：<?phprequire_once "Mail.php";$from = "Sandra Sender <[e-mail]>";$to = "Ramona Recipient <[e-mail]>";$subject = "Hi!";$body = "Hi,\n\nHow are you?";$host = "smtp.gmail.com";$port = "587";$username = "[e-mail]";$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("<p>" . $mail->getMessage() . "</p>"); } else {  echo("<p>Message successfully sent!</p>"); }?>