This file is indexed.

/usr/share/sendmail/cf/mailer/mail11.m4 is in sendmail-cf 8.15.2-8.

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

The actual contents of the file can be viewed below.

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PUSHDIVERT(-1)
#
# Copyright (c) 1998-2001 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.
#
#
# Not exciting enough to bother with copyrights and most of the
# rulesets are based from those provided by DEC.
# Barb Dijker, Labyrinth Computer Services, barb@labyrinth.com
#
# This mailer is only useful if you have DECNET and the
# mail11 program - gatekeeper.dec.com:/pub/DEC/gwtools.
#
# For local delivery of DECNET style addresses to the local
# DECNET node, you will need feature(use_cw_file) and put
# your DECNET nodename in in the cw file.
#
ifdef(`MAIL11_MAILER_PATH',, `define(`MAIL11_MAILER_PATH', /usr/etc/mail11)')
_DEFIFNOT(`MAIL11_MAILER_FLAGS', `nsFx')
ifdef(`MAIL11_MAILER_ARGS',, `define(`MAIL11_MAILER_ARGS', mail11 $g $x $h $u)')
define(`_USE_DECNET_SYNTAX_')
define(`_LOCAL_', ifdef(`confLOCAL_MAILER', confLOCAL_MAILER, `local'))
define(`_MAIL11_QGRP', `ifelse(defn(`MAIL11_MAILER_QGRP'),`',`', ` Q=MAIL11_MAILER_QGRP,')')dnl

POPDIVERT

PUSHDIVERT(3)
# DECNET delivery
R$* < @ $=w .DECNET. >		$#_LOCAL_ $: $1			local DECnet
R$+ < @ $+ .DECNET. >		$#mail11 $@ $2 $: $1		DECnet user
POPDIVERT

PUSHDIVERT(6)
CPDECNET
POPDIVERT

###########################################
###   UTK-MAIL11 Mailer specification   ###
###########################################

VERSIONID(`$Id: mail11.m4,v 8.23 2013-11-22 20:51:14 ca Exp $')

SMail11To
R$+ < @ $- .UUCP >	$: $2 ! $1		back to old style
R$+ < @ $- .DECNET >	$: $2 :: $1		convert to DECnet style
R$+ < @ $- .LOCAL >	$: $2 :: $1		convert to DECnet style
R$+ < @ $=w. >		$: $2 :: $1		convert to DECnet style
R$=w :: $+		$2			strip local names
R$+ :: $+		$@ $1 :: $2		already qualified

SMail11From
R$+			$: $>Mail11To $1	preprocess
R$w :: $+		$@ $w :: $1		ready to go

Mmail11, P=MAIL11_MAILER_PATH, F=_MODMF_(MAIL11_MAILER_FLAGS, `MAIL11'), S=Mail11From, R=Mail11To,
	T=DNS/X-DECnet/X-Unix,_MAIL11_QGRP
	A=MAIL11_MAILER_ARGS