This file is indexed.

/etc/network/if-down.d/sendmail is in sendmail-base 8.14.4-8+deb8u2.

This file is owned by root:root, with mode 0o755.

The actual contents of the file can be viewed below.

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#!/bin/sh
#
# This script is called when a network device goes down.
#		 
# Here is where we'll stop sendmail if needed
#
# Written By Richard Nelson <cowboy@debian.org>
#
# NOTE: The following lines (without the #) must be in /etc/mail/sendmail.mc:
# include(`/etc/mail/dialup.m4')dnl
# include(`/etc/mail/provider.m4')dnl
#

# These variables are for the use of the scripts run by run-parts
#IFACE=;
#IF_ADDRESS=;
#IF_PROVIDER=;

if [ ! -z "$IFACE" ]; then
	addr=$IF_ADDRESS;
	provider=$IF_PROVIDER;
	iface=$IFACE;
else
	addr=$1;
	provider=$2;
	iface=$3;
	fi;

if [ -z "$provider" ]; then
	exit 0;
	fi;

# Bring in some script functions to handle dynamic configuration
. /usr/share/sendmail/dynamic;

# Note the interface that just changed
update_interface "$iface" "STOP";

# If anything has been changed, update sendmail.cf and reload
update_sendmail "ifupdown";

exit 0;