postinst is in courier-webadmin 0.78.0-2ubuntu2.
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  | #!/bin/sh
set -e
# Source debconf library
. /usr/share/debconf/confmodule
add_override() {
    if ! dpkg-statoverride --list $4 >/dev/null; then
	dpkg-statoverride --update --add $1 $2 $3 $4
    fi
}
if [ "$1" = "configure" ]; then
    add_override root courier 0750 /etc/courier/webadmin
    add_override root courier 0750 /etc/courier/webadmin/added
    add_override root courier 0750 /etc/courier/webadmin/removed
    add_override root courier 4755 /usr/lib/courier/courier/webmail/webadmin
    # install CGI script for Courier web administration
    db_get courier-webadmin/install-cgi
    if [ "$RET" = "true" ]; then
	cp -p /usr/lib/courier/courier/webmail/webadmin /usr/lib/cgi-bin/courierwebadmin
	chmod 4555 /usr/lib/cgi-bin/courierwebadmin
    fi
    # record password for Courier web administration
    db_get courier-webadmin/password
    if [ "$RET" ]; then
	touch /etc/courier/webadmin/password
	chmod 0640 /etc/courier/webadmin/password
	chown root:courier /etc/courier/webadmin/password
	echo $RET > /etc/courier/webadmin/password
    fi
fi
exit 0
 |