How to sent mail in PHP.

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PHP

Dear sir
I am new in php.
I want to sent a mail using SMTP Authentication by host, Username,Password
and want to sent mail on my domain emailID,



i am using folling code

<?php
require_once "Mail.php";
 $from = "jitendragupta1040@gmail.com";
 $to = "nitin.nammdev@osmoindia.com,jitendra.gupta@osmoindia.com";
 // $subject = $_POST['vname'];
 // $body= $_POST['vemail'];
  $subject = "hi";
  $body= "Hello";
  $host = "smtpcorp.com";
  $username = "rahul.gupta@osmoindia.com";
  $password = "mypassword";
  $port = "587";
  $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>");  }
  ?>

but it giving following error
Fatal error: Class 'Mail' not found in /home/securenet/Sent/1/Mail.php on line 14

please help to sent email.

thankyou advance.