phpでメール送信

mailsend.php

<?php
mb_language("Japanese");
mb_internal_encoding("UTF-8");
$mail_to = '[email protected]';
$subject = 'test';
$mail_text = 'テストメール';
$reply_to = 'From: [email protected]';
$result = mb_send_mail($mail_to, $subject, $mail_text, $reply_to);
if ($result) {
  echo 'success';
}
else {
  echo 'fail';
}
?>