; 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 300	; 5 minutes
@			IN SOA	mname1. . (
				2000042407 ; serial
				20         ; refresh (20 seconds)
				20         ; retry (20 seconds)
				1814400    ; expire (3 weeks)
				3600       ; minimum (1 hour)
				)
			NS	ns1
ns1			A	10.53.0.1
@			MX	0 m1.mail-servers.example.
@			MX	0 m2.mail-servers.example.
@			MX	0 m3.mail-servers.example.
@			MX	0 m4.mail-servers.example.
@			MX	0 m5.mail-servers.example.
@			MX	0 m6.mail-servers.example.
@			MX	0 m7.mail-servers.example.
@			MX	0 m8.mail-servers.example.
@			MX	0 m9.mail-servers.example.
@			MX	0 m10.mail-servers.example.
@			MX	0 m11.mail-servers.example.
@			MX	0 m12.mail-servers.example.
@			MX	0 m13.mail-servers.example.
@			MX	0 m14.mail-servers.example.
@			MX	0 m15.mail-servers.example.
@			MX	0 m16.mail-servers.example.
@			MX	0 m17.mail-servers.example.
@			MX	0 m18.mail-servers.example.
@			MX	0 m19.mail-servers.example.
@			MX	0 m20.mail-servers.example.
@			MX	0 m21.mail-servers.example.
@			MX	0 m22.mail-servers.example.
@			MX	0 m23.mail-servers.example.
@			MX	0 m24.mail-servers.example.
@			MX	0 m25.mail-servers.example.
@			MX	0 m26.mail-servers.example.
@			MX	0 m27.mail-servers.example.
@			MX	0 m28.mail-servers.example.
@			MX	0 m29.mail-servers.example.