/usr/share/sendmail/cf/feature/require_rdns.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) 2006 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)dnl
VERSIONID(`$Id: require_rdns.m4,v 1.2 2013-11-22 20:51:11 ca Exp $')
divert(-1)
define(`_REQUIRE_RDNS_', `')
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