自己动手写邮件发送函数.

$username = '601200376@163.com';  //用户名
$password = 'x';                  //密码
$from     = '601200376@163.com';  //谁发送的
$to       = '601200376@qq.com';   //发送给谁
$subject  = 'EmailTest';          //主题
$body     = 'EmailBody';          //内容
$smtpHost = 'smtp.163.com';       //smtp服务器
$smtpPort = 25;                   //smtp服务器端口
$sends    = array();
$fp       = fsockopen($smtpHost, $smtpPort, $errno, $errstr, 30);  //建立连接


$sends[]  = "EHLO xiaokai\r\n";  //告诉服务器我是谁
$sends[]  = "AUTH LOGIN\r\n";    //登录验证
$sends[]  = base64_encode($username) . "\r\n";  //发送用户名 base64加密
$sends[]  = base64_encode($password) . "\r\n";  //同上, 发送密码
$sends[]  = "MAIL FROM: <$from>\r\n";  
$sends[]  = "RCPT TO: <$to>\r\n";
$sends[]  = "DATA\r\n";
$sends[]  = "From: $from\r\n";
$sends[]  = "To: $to\r\n";
$sends[]  = "Subject: $subject\r\n";
$sends[]  = $body;
$sends[]  = "\r\n.\r\n";
$sends[]  = "QUIT\r\n";


//下面是打印出发送信息以及服务器返回的信息.
echo "<table border=1>";
foreach ($sends as $send) {
    fputs($fp, $send);
    echo '<tr>';
   echo '<td>' . $send . '</td>';
    echo '<td>' . fgets($fp) . '</td>';
    echo '</tr>';
}
echo "</table>";
fclose($fp);