postinst is in poppassd 1.8.5-4.
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 | #!/bin/sh
set -e
update-inetd --comment-chars "#disabled#" --disable poppassd
update-inetd --group MAIL --add 'poppassd\tstream\ttcp\tnowait\troot\t/usr/sbin/tcpd\t/usr/sbin/poppassd'
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