[Web] Remove file

data/web/mta_sts.php

@@ -1,18 +0,0 @@
-<?php
-error_reporting(0);
-header('Content-Type: text/plain');
-
-echo $_SERVER['HTTP_HOST'];
-
-foreach (dns_get_record('mailcow.email', DNS_MX) as $mx_r) {
-  $mx_s[] = $mx_r['target'];
-}
-
-!empty($mx_s) ?: exit();
-
-echo 'version: STSv1' . PHP_EOL;
-echo 'mode: enforce' . PHP_EOL;
-foreach ($mx_s as $mx_r) {
-  printf('mx: %s' . PHP_EOL, $mx_r);
-}
-echo 'max_age: 86400' . PHP_EOL;