用php启动联系表单

I am trying to power my contact form with the following HTML and PHP, and when I enter information and press enter, I always get an Error!

HTML

<form action="contact.php" method="POST">
  <input type="text" placeholder="your name" name="name">
  <input type="email" placeholder="Your Email" name="email">
  <textarea placeholder="Your Message" name="message"></textarea>
  <button type="submit">submit</button>
</form>

PHP

<?php
  $name = $_POST['name'];
  $email = $_POST['email'];
  $message = $_POST['message'];
  $formcontent=" From: $name 
 Email: $email 
 Message: $message";
  $recipient = "jainkenul@gmail.com";
  $subject = "Contact Form";
  $mailheader = "From: $email 
";
  mail($recipient, $subject, $formcontent, $mailheader) or die("Error!");
  echo "Thank You!";
?>

I have uploaded these files on my server, you can check it here

I don't see any error in your code. Probably, your host may have disabled the mail() function