This file is indexed.

/usr/share/sendmail/cf/feature/delay_checks.m4 is in sendmail-cf 8.15.2-3.

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) 1999-2000 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.
#
#

divert(0)
VERSIONID(`$Id: delay_checks.m4,v 8.9 2013-11-22 20:51:11 ca Exp $')
divert(-1)

define(`_DELAY_CHECKS_', 1)
ifelse(defn(`_ARG_'), `',  `',
	lower(substr(_ARG_,0,1)), `f', `define(`_SPAM_FRIEND_', 1) define(`_SPAM_FH_', 1)',
	lower(substr(_ARG_,0,1)), `h', `define(`_SPAM_HATER_', 1)  define(`_SPAM_FH_', 1)',
	`errprint(`*** ERROR: illegal argument _ARG_ for FEATURE(delay_checks)
')
	')

dnl be backward compatible by default 
ifelse(len(X`'_ARG2_), `1', `define(`_DELAY_COMPAT_8_10_', 1)', `')