Php mail

Ovaj kod sam ja prije koristio, vidio sam ga na SO. Skripta koristi 'mail'  iz PEAR paketa. Mozes ga skinuti ovde: http://pear.php.net/package/Mail/

kod:

<?php

    require_once "Mail.php";

     $from = "<from.gmail.com>";
     $to = "<to.yahoo.com>";
     $subject = "Hi!";
     $body = "Hi,\n\nHow are you?";

     $host = "ssl://smtp.gmail.com";
     $port = "465";
     $username = "<myaccount.gmail.com>";
     $password = "password";

     $headers = array ('From' => $from,
      'To' => $to,
      'Subject' => $subject);
     $smtp = Mail::factory('smtp',
      array ('host' => $host,
       'port' => $port,
       'auth' => true,
       'username' => $username,
       'password' => $password));

     $mail = $smtp->send($to, $headers, $body);

     if (PEAR::isError($mail)) {
      echo("<p>" . $mail->getMessage() . "</p>");
     } else {
      echo("<p>Message successfully sent!</p>");
     }

   ?>

Koristim XAMPP tj.Apache i ajde ako mi mozes objasnit to s mercurijem.

Izbaci mi problem:

Warning: mail() [function.mail]: SMTP server response: 554 <njegovmail@google.com>: Relay access denied in C:\xampp\htdocs\mejl.php on line 59

evo upalio sam Mercury pa je to izbacio al neznam sta sad trebam.

Ma mozes mi objasnit kako to instalirati, neznam ti ja to...