postrm is in spamass-milter 0.4.0-1+b1.
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
case "$1" in
    purge)
	# remove /var/lib/spamass-milter if it exists
	if [ -e /var/lib/spamass-milter ]; then
	    rmdir --ignore-fail-on-non-empty /var/lib/spamass-milter
	fi;
	# remove /var/spool/postfix/spamass if it exists
	if [ -e /var/spool/postfix/spamass ]; then
	    rmdir --ignore-fail-on-non-empty /var/spool/postfix/spamass
	fi;
	;;
    *) 
	# do nothing
	;;
esac
### Automatically added by dh_installinit
if [ "$1" = "purge" ] ; then
	update-rc.d spamass-milter remove >/dev/null
fi
# In case this system is running systemd, we make systemd reload the unit files
# to pick up changes.
if [ -d /run/systemd/system ] ; then
	systemctl --system daemon-reload >/dev/null || true
fi
# End automatically added section
##
exit 0;
 |