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求助:邮件发送、、、失败

PHP code
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require_once ('email.class.php');
//##########################################
$smtpserver = "smtp.qq.com";//SMTP服务器
$smtpserverport =25;//SMTP服务器端口
$smtpusermail = "1037572236@qq.com";//SMTP服务器的用户邮箱
$smtpemailto = "1037572236@qq.com";//发送给谁
$smtpuser = "1037572236";//SMTP服务器的用户帐号
$smtppass = $pw;//SMTP服务器的用户密码
$mailsubject = "PHP100测试邮件系统";//邮件主题
$mailbody = "<h1 id="这是一个测试程序-PHP-com"> 这是一个测试程序 PHP100.com </h1>";//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  
Disconnected from remote host 

MIME-Version:1.0 Content-Type:text/html To: 1037572236@qq.com From: 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:

------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
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