<?php # Script must return TRUE (if allright) or FALSE (if e-mail not valid)

if (!filter_var($_POST['email'], FILTER_VALIDATE_EMAIL)) {
	echo 0;
	exit;
}

define('TO', 'romannovohackii@gmail.com'); // Your e-mail adress
define('FROM', "From: My website <hello@{$_SERVER['HTTP_HOST']}>\r\n");
define('SUBJECT', 'New subscribe'); // Subject of mail
$message = $_POST['email'];

$r = mail(TO, SUBJECT, $message, FROM);

echo ($r) ? 1 : 0;