How to use SMTP function in mail by php

Can any one tell me how i can implement SMTP function in my this code

<?php
$your_email ='biometrics@raydox.com';// <<=== update to your email address

session_start();
$errors = '';
$name = '';
$visitor_email = '';
$user_message = '';

if(isset($_POST['submit']))
{

$name = $_POST['name'];
$visitor_email = $_POST['email'];
$user_message = $_POST['message'];
///------------Do Validations-------------
if(empty($name)||empty($visitor_email))
{
$errors .= "\n Name and Email are required fields. ";
}
if(IsInjected($visitor_email))
{
$errors .= "\n Bad email value!";
}
if(empty($_SESSION['6_letters_code'] ) ||
strcasecmp($_SESSION['6_letters_code'], $_POST['6_letters_code']) != 0)
{
//Note: the captcha code is compared case insensitively.
//if you want case sensitive match, update the check above to
// strcmp()
$errors .= "\n The captcha code does not match!";
}

if(empty($errors))
{
//send the email
$to = $your_email;
$subject="New form submission";
$from = $your_email;
$ip = isset($_SERVER['REMOTE_ADDR']) ? $_SERVER['REMOTE_ADDR'] : '';

$body = "A user $name submitted the contact form:\n".
"Name: $name\n".
"Email: $visitor_email \n".
"Message: \n ".
"$user_message\n".
"IP: $ip\n";

$headers = "From: $from \r\n";
$headers .= "Reply-To: $visitor_email \r\n";

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

header('Location: http://www.raydox.com/');
}
}

// Function to validate against any email injection attempts
function IsInjected($str)
{
$injections = array('(\n+)',
'(\r+)',
'(\t+)',
'(%0A+)',
'(%0D+)',
'(%08+)',
'(%09+)'
);
$inject = join('|', $injections);
$inject = "/$inject/i";
if(preg_match($inject,$str))
{
return true;
}
else
{
return false;
}
}
?>

 

I also want to know its solution. Will keep an eye on this thread to know about it. thanks for posting.

 

Use the PHPMailer class and follow its documentation for smtp usage.

 

Actully i am not getting you even i used PHPmailer function but the problem continue can u plz provide me in detail step by step or nay website where i get help on mail through smtp server.