php使用邮件功能发送邮件

Question

<?

  mb_internal_encoding('UTF-8');
  $servicemail="joekyli820@hotmail.com";
  $webname="Chun Yiu Company";
  $email=$_POST['email'];
  $subject=$webname."Replacement ID Password";
  $subject=mb_encode_mimeheader($subject, 'UTF-8');

  $body="Hello Dear Member, Here is your new Password, please save your data, thank you:<br />
         Your new password is:".$password."<br />
         any problem，you can touch us，thank you!!";

  $headers = "MIME-Version: 1.0\r\n";
  $headers .= "Content-type: text/html; charset=utf-8\r\n";
  $headers .= "From:".mb_encode_mimeheader($webname, 'UTF-8')."<".$servicemail."> \r\n";
  $headers .= "Reply-To:".mb_encode_mimeheader($webname, 'UTF-8')."<".$servicemail.">\r\n";
  $headers .= "Return-Path:".mb_encode_mimeheader($webname, 'UTF-8')."<".$servicemail.">\r\n";

  mail ($email,$subject,$body,$headers);

?>

为什么我不能使用此代码通过电子邮件功能获取我的密码？非常感谢你。