Having a problem with email submission form?

[The Vault]

I was wondering if anyone could be of assistance, I'm having problems setting up the email us section of my webpage... this is the code I am using. When the details are completed on the form and is submitted it says 'email sent' but it is not received?

Any tips, or pointing out what I've done wrong, would be gratefully received.

<?php
 
include 'functions.php';
 
if (!empty($_POST)){
 
  $data['success'] = true;
  $_POST  = multiDimensionalArrayMap('cleanEvilTags', $_POST);
  $_POST  = multiDimensionalArrayMap('cleanData', $_POST);
 
  //your email address 
  $emailTo ="[e-mail]"; //"[e-mail]";
 
  //from email address
  $emailFrom ="[e-mail]"; //"[e-mail]";
 
  //email subject
  $emailSubject = "Mail from The Vault";
 
  $name = $_POST["name"];
  $email = $_POST["email"];
  $comment = $_POST["comment"];
  if($name == "")
   $data['success'] = false;
 
 if (!preg_match("/^[_\.0-9a-zA-Z-]+@([0-9a-zA-Z][0-9a-zA-Z-]+\.)+[a-zA-Z]{2,6}$/i", $email)) 
   $data['success'] = false;
 
 
 if($comment == "")
   $data['success'] = false;
 
 if($data['success'] == true){
 
  $message = "NAME: $name<br>
  EMAIL: $email<br>
  COMMENT: $comment";
 
 
  $headers = "MIME-Version: 1.0" . "\r\n"; 
  $headers .= "Content-type:text/html; charset=utf-8" . "\r\n"; 
  $headers .= "From: <$emailFrom>" . "\r\n";
  mail($emailTo, $emailSubject, $message, $headers);
 
  $data['success'] = true;
  echo json_encode($data);
}
}