Contact form help

Hi There, would anyone be able to advise how I can add SMTP auth to this script?

my host has recently dropped PHP Mail and i have become a bit stuck as the contact form i was using now no longer works

<?php
// Get Data	
$name = strip_tags($_POST['name']);
$email = strip_tags($_POST['email']);
$phone = strip_tags($_POST['phone']);
$url = strip_tags($_POST['url']);
$message = strip_tags($_POST['message']);

// Send Message
mail( "yournameeeee@gmail.com", "Contact Form Submission",
"Name: $name\nEmail: $email\nPhone: $phone\nWebsite: $url\nMessage: $message\n",
"From: Forms <forms@example.net>" );
?>

Thanks for your time guys