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<?php
if($_POST) {
  $to = "admin@hztechnology.net"; // your mail here
  $fname = filter_var($_POST["firstname"], FILTER_SANITIZE_EMAIL);
  $lname = filter_var($_POST["lastname"], FILTER_SANITIZE_EMAIL);
  $email = filter_var($_POST["email"], FILTER_SANITIZE_EMAIL);
  $comment = filter_var($_POST["comment"], FILTER_SANITIZE_STRING);
  $headers = "From: $email"; 
  $subject = "You have a message sent from your site"; 
  $body = "E-mail: $email\n\nFrom: First Name: $fname + Last Name: $lname\n\nMessage: $comment";
  
  if(mail($to, $subject, $body, $headers)) {
    $output = json_encode(array('success' => true));
    die($output);
  } else {
    $output = json_encode(array('success' => false));
    die($output);
  }
}
?>