preinst is in sendmail-base 8.15.2-3.
This file is a maintainer script. It is executed when installing (*inst) or removing (*rm) the package.
The actual contents of the file can be viewed below.
| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 | #!/bin/sh
set -e;
PACKAGE=sendmail-base;
if [ -L /usr/share/doc/$PACKAGE ]; then
	# /usr/share/doc/$PACKAGE was a symlink to /usr/share/doc/sendmail
	rm /usr/share/doc/$PACKAGE
fi
if [ -L /usr/share/bug/$PACKAGE ]; then
	rm /usr/share/bug/$PACKAGE
fi
if [ "$1" = "upgrade" ] && dpkg --compare-versions "$2" lt "8.14.4-2.2~"; then
	# /usr/share/doc/$PACKAGE was a symlink to /usr/share/doc/sendmail
	rm -rf /usr/share/doc/sendmail/examples
	rm -f /usr/share/doc/sendmail/Debian-specific.gz
	rm -f /usr/share/doc/sendmail/site.config.m4.gz
fi
if [ "$1" = "upgrade" ]; then
		# Prevent cronjob from running during upgrade...
		if [ -f /etc/cron.d/sendmail ]; then
			echo "#preinst" > /etc/cron.d/sendmail;
			fi;
		# Move files to new home
		if [ -d /etc/mail/ssl ]; then
			mv -f /etc/mail/ssl /etc/mail/tls;
			fi;
fi
# Automatically added by dh_installdeb
dpkg-maintscript-helper rm_conffile /etc/dhcp3/dhclient-exit-hooks.d/sendmail 8.14.4-2.2~ -- "$@"
# End automatically added section
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