/usr/share/sendmail/cf/feature/use_ct_file.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.
# Copyright (c) 1983 Eric P. Allman. All rights reserved.
# Copyright (c) 1988, 1993
# The Regents of the University of California. 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: use_ct_file.m4,v 8.12 2013-11-22 20:51:11 ca Exp $')
divert(-1)
# if defined, the sendmail.cf will read the /etc/mail/trusted-users file to
# find the names of trusted users. There should only be a few of these.
define(`_USE_CT_FILE_', `')
divert(0)
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