Normal mail gönderme işlemi olmuyor veritabanı kaydı oluyor

stackoverflow da böyle birşey gördüm hepten hata aldım(Kendime göre düzenledim) daha önce amp de form ve mail işlemleri yapan arkadaş varsa bilgi verebilirmi

<?php
if(!empty($_POST)){
$name=$_POST['name'];
$email = $_POST['email'];
$message = $_POST['message'];
$formcontent=" From: $name \n Message: $message";
$recipient = "[email protected]";
$subject = "Message From: $name";
$mailheader = "From: $email \r\n";
mail($recipient, $subject, $formcontent, $mailheader) or die("Error!");

$domain_url = (isset($_SERVER['HTTPS']) ? "https" : "http") . "://$_SERVER[HTTP_HOST]";
 header("Content-type: application/json");
 header("Access-Control-Allow-Credentials: true");
 header("Access-Control-Allow-Origin: ". str_replace('.', '-','https://mywebsite.com') .".cdn.ampproject.org");
 header("AMP-Access-Control-Allow-Source-Origin: " . $domain_url);
 header("Access-Control-Expose-Headers: AMP-Access-Control-Allow-Source-Origin");
 header("AMP-Redirect-To: https://mywebsite.com/index.html");
 header("Access-Control-Expose-Headers: AMP-Redirect-To, AMP-Access-Control-Allow-Source-Origin"); 
 echo json_encode(array('name' => $name));
 exit;
}
?>