mail.php

mail.php

<?php
$SECRET = '....';

header("Content-type: application/json");

if ($_GET["secret"] != $SECRET) {
  http_response_code(401);
  echo json_encode(array(
    "success" => false,
    "status_code" => 401
   ));
  return;
}

$postData=file_get_contents("php://input");

$additional_options = "";
$headers = "";
$headers .= 'X-Mailer: PHP/' . phpversion() . "\r\n";
$headers .= 'MIME-Version: 1.0' . "\r\n";/* note double quote here*/
$headers .= 'Content-Type: text/html; charset=UTF-8' . "\r\n";/* here too*/
if (isset($_GET["from"])) {
    $headers .= "From: <".$_GET["from"].">\r\n";
    $headers .= "Return-Path: <".$_GET["from"].">\r\n";
    $additional_options = " -f ". $_GET["from"];
}
if (isset($_GET["replyto"])) {
    $headers .= "Reply-To: <".$_GET["replyto"].">\r\n";
}
$to = isset($_GET["to"]) ? $_GET["to"] : "root";
$subject = isset($_GET["subject"]) ? $_GET["subject"] : "Mail sent by mail.php";

$REQUEST = $_REQUEST;
unset($REQUEST["secret"]);
$message .= json_encode(json_decode($postData), JSON_PRETTY_PRINT);

http_response_code(202);
mail($to, $subject, $message, $headers, $additional_options);
echo json_encode(array(
  "success" => true,
  "status_code" => 202
));
?>