This file is indexed.

/etc/ppp/ip-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 ppp disconnects from the network.
#		 
# 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
#PPP_IFACE="$1";
#PPP_TTY="$2";
#PPP_SPEED="$3";
#PPP_LOCAL="$4";
#PPP_REMOTE="$5";
#PPP_IPPARAM="$6";

if [ ! -z "$PPP_LOCAL" ]; then
	addr=$PPP_LOCAL;
	provider=$PPP_IPPARAM;
	iface=$PPP_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
# Actually, we'll delay the reload because we'll be hit in a moment
# to handle the change by /etc/network/if-up.d/sendmail
update_sendmail "ppp" Delayed;

exit 0;