preinst is in sendmail-base 8.15.2-10.
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 | #!/bin/sh
set -e;
if [ "$1" = "upgrade" ]; then
		# Prevent cronjob from running during upgrade...
		if [ -f /etc/cron.d/sendmail ]; then
			echo "#preinst" > /etc/cron.d/sendmail;
			fi;
		# Move files to new home
		if [ -d /etc/mail/ssl ] && [ ! -e /etc/mail/tls ]; then
			mv -f /etc/mail/ssl /etc/mail/tls;
			fi;
fi
# Automatically added by dh_installdeb/11.1.4ubuntu1
dpkg-maintscript-helper rm_conffile /etc/dhcp3/dhclient-exit-hooks.d/sendmail 8.14.4-2.2\~ -- "$@"
# End automatically added section
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