/usr/share/sendmail/cf/feature/preserve_luser_host.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) 2000, 2002 Proofpoint, 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: preserve_luser_host.m4,v 1.4 2013-11-22 20:51:11 ca Exp $')
divert(-1)
ifdef(`LUSER_RELAY', `',
`errprint(`*** LUSER_RELAY should be defined before FEATURE(`preserve_luser_host')
')')
define(`_PRESERVE_LUSER_HOST_', `1')
define(`_NEED_MACRO_MAP_', `1')
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