邮件发送、失败

求助：邮件发送、、、失败

PHP code

 这是一个测试程序 PHP100.com ";//邮件内容
$mailtype = "HTML";//邮件格式（HTML/TXT）,TXT为文本邮件
##########################################
$smtp = new smtp($smtpserver,$smtpserverport,true,$smtpuser,$smtppass);//这里面的一个true是表示使用身份验证,否则不使用身份验证.
$smtp->debug = true;//是否显示发送的调试信息
$smtp->sendmail($smtpemailto, $smtpusermail, $mailsubject, $mailbody, $mailtype);

?>

提示错误：
Trying to smtp.qq.com:25
220 smtp.qq.com Esmtp QQ Mail Server
Connected to relay host smtp.qq.com
> HELO localhost
250 smtp.qq.com
> AUTH LOGIN MTAzNzU3MjIzNg==

Error: Remote host returned ""
Error: Error occurred while sending HELO command.
Error: Cannot send email to <1037572236@qq.com>
Disconnected from remote host

MIME-Version:1.0 Content-Type:text/html To: 1037572236@qq.com From: 1037572236@qq.com<1037572236@qq.com> Subject: PHP100测试邮件系统 Date: Thu, 15 Sep 2011 08:26:15 +0000 X-Mailer:By Redhat (PHP/5.2.5) Message-ID: <20110915082615.640627.1037572236@qq.com>

------解决方案--------------------
smtp.qq.com qq有提供SMTP，POP3？
------解决方案--------------------
是否安装了smtp service
25端口是否开启
------解决方案--------------------
腾讯的发送邮件服务器：smtp.qq.com，使用SSL，端口号465或587