/usr/share/sendmail/cf/feature/relay_local_from.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, 2001 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: relay_local_from.m4,v 8.7 2013-11-22 20:51:11 ca Exp $')
divert(-1)
define(`_RELAY_LOCAL_FROM_', 1)
errprint(`*** WARNING: FEATURE(`relay_local_from') may cause your system to act as open
relay. Use SMTP AUTH or STARTTLS instead. If you cannot use those,
try FEATURE(`relay_mail_from').
')
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