How to send email using phpmaill

<?php
include "mail.php";
if (!empty($_POST[&#39;to&#39;])  && !empty($_POST[&#39;fromname&#39;]) && !empty($_POST[&#39;title&#39;]) && !empty($_POST[&#39;content&#39;])) {send_mail($_POST[&#39;to&#39;],$_POST[&#39;fromname&#39;],$_POST[&#39;title&#39;],$_POST[&#39;content&#39;]);
}
?>
<form action="#" method="post">
接收人：<input type="text" name="to" /><br>
发件人昵称：<input type="text" name="fromname" /><br>
标题：<input type="text" name="title" /><br>
内容：<input type="text" name="content" style="width:400;height:100;" /><br>
<input type="submit" value="提交" />
注:默认是用作者的QQ邮箱发送 请注意改成自己的数据
</form>

<?php 
header("content-type:text/html;charset=utf-8"); 
ini_set("magic_quotes_runtime",0); 
require &#39;php_mail/class.phpmailer.php&#39;; 
require &#39;php_mail/class.smtp.php&#39;; 
function send_mail($to,$fromname,$title,$content){
try { 
$mail = new PHPMailer(true); 
$mail->IsSMTP(); 
$mail->CharSet=&#39;UTF-8&#39;; //设置邮件的字符编码，这很重要，不然中文乱码 
$mail->SMTPAuth = true; //开启认证 
$mail->Port = 25; //端口请保持默认
$mail->Host = "smtp.qq.com"; //使用QQ邮箱发送
$mail->Username = "903215283@qq.com"; //这个可以替换成自己的邮箱
$mail->Password = "nelfobtugzckbdae"; //注意 这里是写smtp的授权码 写的不是QQ密码，此授权码不可用
//$mail->IsSendmail(); //如果没有sendmail组件就注释掉，否则出现“Could not execute: /var/qmail/bin/sendmail ”的错误提示 
$mail->AddReplyTo("903215283@qq.com","mckee");//回复地址 
$mail->From = "903215283@qq.com"; 
$mail->FromName = $fromname; 
$to = $to; 
$mail->AddAddress($to); 
$mail->Subject = $title; 
$mail->Body = $content;
$mail->AltBody = "To view the message, please use an HTML compatible email viewer!"; //当邮件不支持html时备用显示，可以省略 
$mail->WordWrap = 80; // 设置每行字符串的长度 
//$mail->AddAttachment("f:/test.png"); //可以添加附件 
$mail->IsHTML(true); 
$mail->Send(); 
echo &#39;邮件已发送&#39;;
} catch (phpmailerException $e) { 
echo "邮件发送失败：".$e->errorMessage(); 
} 
return true;
}
//环境 PHP5.3亲测可用
?>