/usr/share/sendmail/cf/feature/relay_based_on_MX.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.
#
# 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_based_on_MX.m4,v 8.12 2013-11-22 20:51:11 ca Exp $')
divert(-1)
define(`_RELAY_MX_SERVED_', 1)
LOCAL_CONFIG
# MX map (to allow relaying to hosts that we MX for)
Kmxserved bestmx -z: -T<TEMP>
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