<?php
    require_once "Mail.php";
    $from = "<niko@gmail.com>";
    $to = "<niko@hotmail.com>";
    $subject = "Hi!";
    $body = "Hi,\n\nHow are you?";
    $host = "ssl://smtp.gmail.com";
    $port = "465";
    $username = "<niko@gmail.com>";
    $password = "somepassworrd";
    $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>");
?> 
When I try to execute these php script I get these error
  FATAL ERROR Class Mail NOT found ON number line 18
I know the above question is possible duplicate of these
Send email using the GMail SMTP server from a PHP page
But its not working.My PHP version is 5.3.4 Xampp 1.7.4 version.
 mail('caffeinated@example.com', 'My Subject', $message); \\ I tried these
But it shows a warning saying that missing headers.
- How do I send an email Using the php script? 
- Can we send an email without using authentication in PHP ? Because vb.net uses server authentication but most of the code i found on google is without authentication for php. so I got a doubt 
Finally please help me with these trying from an 2 hours or so!
 
     
    