/usr/share/sendmail/cf/m4/version.m4 is in sendmail-cf 8.15.2-10.
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) 1998-2015 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.
#
#
VERSIONID(`$Id: version.m4,v 8.237 2014-01-27 12:55:17 ca Exp $')
#
divert(0)
# Configuration version number
DZ8.15.2`'ifdef(`confCF_VERSION', `/confCF_VERSION')
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