邮件发送、失败

求助：邮件发送、、、失败

PHP code

<!--Code highlighting produced by Actipro CodeHighlighter (freeware)http://www.CodeHighlighter.com/--><?require_once ('email.class.php');//##########################################$smtpserver = "smtp.qq.com";//SMTP服务器$smtpserverport =25;//SMTP服务器端口$smtpusermail = "[email&#160;protected]";//SMTP服务器的用户邮箱$smtpemailto = "[email&#160;protected]";//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$mailbody = "<h1> 这是一个测试程序 PHP100.com ";//邮件内容$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  
Disconnected from remote host 

MIME-Version:1.0 Content-Type:text/html To: [email protected] From: [email protected] 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