/usr/share/sendmail/cf/feature/blacklist_recipients.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: blacklist_recipients.m4,v 8.14 2013-11-22 20:51:11 ca Exp $')
divert(-1)
ifdef(`_ACCESS_TABLE_',
`define(`_BLACKLIST_RCPT_', 1)',
`errprint(`*** ERROR: FEATURE(blacklist_recipients) requires FEATURE(access_db)
')')
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