ajax.php

<?php
$name = $_POST["contact-name"];
$email = $_POST["contact-email"];
$comments = $_POST["contact-comment"];
$sender = $_POST["contact-sender"];
$receiver = $_POST["contact-receiver"];
 
if (!is_null($name) && !is_null($email) && !is_null($comments)) {
  $subject = "[Strongbowcider.us] " . substr($comments, 0, 20) . "...";
  $body = "Name: " . $name . "<". $email ."> \n\nComments: " . $comments;
  $headers = "From:" . $sender . "\r\n" .
             "Subject:" .  $subject . "\r\n" . 
             "Reply-To:" .  $email . "\r\n";
 
  if(mail($receiver, $subject, $body, $headers)) {
    echo "1";
  } else {
    echo "2";
  }
} else {
  echo "3";
}