This file is indexed.

/usr/share/sendmail/cf/cf/tcpproto.mc is in sendmail-cf 8.15.2-10.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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divert(-1)
#
# Copyright (c) 1998-2000 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.
#
#

#
#  This is the prototype file for a configuration that supports nothing
#  but basic SMTP connections via TCP.
#
#  You MUST change the `OSTYPE' macro to specify the operating system
#  on which this will run; this will set the location of various
#  support files for your operating system environment.  You MAY
#  create a domain file in ../domain and reference it by adding a
#  `DOMAIN' macro after the `OSTYPE' macro.  I recommend that you
#  first copy this to another file name so that new sendmail releases
#  will not trash your changes.
#

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VERSIONID(`$Id: tcpproto.mc,v 8.15 2013-11-22 20:51:08 ca Exp $')
OSTYPE(`unknown')
FEATURE(`nouucp', `reject')
MAILER(`local')
MAILER(`smtp')