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 "2";
}