This file is indexed.

/usr/share/sendmail/cf/feature/nullclient.m4 is in sendmail-cf 8.14.4-4.1ubuntu1.

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 Sendmail, 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.
#
#
ifelse(defn(`_ARG_'), `', `errprint(`Feature "nullclient" requires argument')',
	`define(`_NULL_CLIENT_', _ARG_)')

#
#  This is used only for relaying mail from a client to a hub when
#  that client does absolutely nothing else -- i.e., it is a "null
#  mailer".  In this sense, it acts like the "R" option in Sun
#  sendmail.
#

divert(0)
VERSIONID(`$Id: nullclient.m4,v 8.24 2000/09/17 17:30:00 gshapiro Exp $')
divert(-1)

undefine(`ALIAS_FILE')
define(`MAIL_HUB', _NULL_CLIENT_)
define(`SMART_HOST', _NULL_CLIENT_)
define(`confFORWARD_PATH', `')
ifdef(`confFROM_HEADER',, `define(`confFROM_HEADER', `<$g>')')
define(`_DEF_LOCAL_MAILER_FLAGS', `lsDFM5q')
MASQUERADE_AS(_NULL_CLIENT_)
FEATURE(`allmasquerade')
FEATURE(`masquerade_envelope')
MAILER(`local')
MAILER(`smtp')