/usr/share/sendmail/cf/feature/lookupdotdomain.m4 is in sendmail-cf 8.14.4-4.1ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# Copyright (c) 2000 Sendmail, Inc. and its suppliers.
# All rights reserved.
#
# By using this file, you agree to the terms and conditions set
# forth in the LICENSE file which can be found at the top level of
# the sendmail distribution.
#
#
divert(0)
VERSIONID(`$Id: lookupdotdomain.m4,v 1.1 2000/04/13 22:32:49 ca Exp $')
divert(-1)
ifdef(`_ACCESS_TABLE_',
`define(`_LOOKUPDOTDOMAIN_')',
`errprint(`*** ERROR: FEATURE(`lookupdotdomain') requires FEATURE(`access_db')
')')
ifdef(`_RELAY_HOSTS_ONLY_',
`errprint(`*** WARNING: FEATURE(`lookupdotdomain') does not work well with FEATURE(`relay_hosts_only')
')')
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