; Copyright (C) Internet Systems Consortium, Inc. ("ISC") ; ; SPDX-License-Identifier: MPL-2.0 ; ; This Source Code Form is subject to the terms of the Mozilla Public ; License, v. 2.0. If a copy of the MPL was not distributed with this ; file, you can obtain one at https://mozilla.org/MPL/2.0/. ; ; See the COPYRIGHT file distributed with this work for additional ; information regarding copyright ownership. $TTL 600 ; 10 minutes @ IN SOA mname1. . ( 1 ; serial 20 ; refresh (20 seconds) 20 ; retry (20 seconds) 1814400 ; expire (3 weeks) 3600 ; minimum (1 hour) ) NS ns2 MX 10 mail ; MX points to a CNAME which is detected by check-mx-cname mail CNAME ns2 ns2 A 10.53.0.2