/usr/share/sendmail/cf/hack/cssubdomain.m4 is in sendmail-cf 8.15.2-3.
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) 1998, 1999 Proofpoint, Inc. and its suppliers.
# All rights reserved.
# Copyright (c) 1983 Eric P. Allman. All rights reserved.
# Copyright (c) 1988, 1993
# The Regents of the University of California. 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: cssubdomain.m4,v 8.10 2013-11-22 20:51:13 ca Exp $')
divert(2)
# find possible (old & new) versions of our name via short circuit hack
# (this code should exist ONLY during the transition from .Berkeley.EDU
# names to .CS.Berkeley.EDU names -- probably not more than a few months)
R$* < @ $=w .CS.Berkeley.EDU > $* $: $1 < @ $j > $3
R$* < @ $=w .Berkeley.EDU> $* $: $1 < @ $j > $3
divert(0)
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