postrm is in dovecot-core 1:2.2.9-1ubuntu2.
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 36 37 38 39 40 41 42 43 44 45 46 47 | #!/bin/sh
set -e
PATH=/usr/sbin:$PATH
export PATH
if [ "$1" = "purge" ] ; then
	for conffile in `ucfq --with-colons dovecot-core | cut -d: -f1`; do
		# we mimic dpkg as closely as possible, so we remove configuration
		# files with dpkg backup extensions too:
		### Some of the following is from Tore Anderson:
		for ext in '~' '%' .bak .dpkg-tmp .dpkg-new .dpkg-old .dpkg-dist .ucf-new .ucf-old .ucf-dist;  do
			rm -f $conffile$ext
		done
		# remove the configuration file itself
		rm -f $conffile
		# and finally clear it out from the ucf database
		if which ucf >/dev/null; then
			ucf --purge $conffile
		fi
		if which ucfr >/dev/null; then
			ucfr --purge dovecot-core $conffile
		fi
	done
    userdel dovecot || true;
    userdel dovenull || true;
    if [ -d /var/run/dovecot ]; then rm -rf /var/run/dovecot; fi
fi
if [ "$1" = "triggered" ]; then
    if [ -x "/etc/init.d/dovecot" ]; then
        if [ -x /usr/sbin/invoke-rc.d ]; then
            invoke-rc.d dovecot start
        else
            /etc/init.d/dovecot start
        fi
    fi
fi
# Automatically added by dh_installdebconf
if [ "$1" = purge ] && [ -e /usr/share/debconf/confmodule ]; then
	. /usr/share/debconf/confmodule
	db_purge
fi
# End automatically added section
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