/usr/share/sendmail/cf/mailer/phquery.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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#
# Copyright (c) 1998-2001 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.
#
#
# Contributed by Kimmo Suominen <kim@tac.nyc.ny.us>.
#
ifdef(`PH_MAILER_PATH',, `define(`PH_MAILER_PATH', /usr/local/etc/phquery)')
_DEFIFNOT(`PH_MAILER_FLAGS', `ehmu')
ifdef(`PH_MAILER_ARGS',, `define(`PH_MAILER_ARGS', `phquery -- $u')')
define(`_PH_QGRP', `ifelse(defn(`PH_MAILER_QGRP'),`',`', ` Q=PH_MAILER_QGRP,')')dnl
POPDIVERT
####################################
### PH Mailer specification ###
####################################
VERSIONID(`$Id: phquery.m4,v 8.18 2013-11-22 20:51:14 ca Exp $')
Mph, P=PH_MAILER_PATH, F=_MODMF_(CONCAT(`nrDFM', PH_MAILER_FLAGS), `PH'), S=EnvFromL, R=EnvToL/HdrToL,
T=DNS/RFC822/X-Unix,_PH_QGRP
A=PH_MAILER_ARGS
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