/usr/share/sendmail/cf/mailer/pop.m4 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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#
# 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.
#
#
ifdef(`POP_MAILER_PATH',, `define(`POP_MAILER_PATH', /usr/lib/mh/spop)')
_DEFIFNOT(`POP_MAILER_FLAGS', `Penu')
ifdef(`POP_MAILER_ARGS',, `define(`POP_MAILER_ARGS', `pop $u')')
define(`_POP_QGRP', `ifelse(defn(`POP_MAILER_QGRP'),`',`', ` Q=POP_MAILER_QGRP,')')dnl
POPDIVERT
####################################
### POP Mailer specification ###
####################################
VERSIONID(`$Id: pop.m4,v 8.23 2013-11-22 20:51:14 ca Exp $')
Mpop, P=POP_MAILER_PATH, F=_MODMF_(CONCAT(`lsDFMq', POP_MAILER_FLAGS), `POP'), S=EnvFromL, R=EnvToL/HdrToL,
T=DNS/RFC822/X-Unix,_POP_QGRP
A=POP_MAILER_ARGS
LOCAL_CONFIG
# POP mailer is a pseudo-domain
CPPOP
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