postinst is in mailutils-pop3d 1:3.4-1.
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 | #! /bin/sh
set -e
update-inetd --group MAIL --add "pop3 \tstream \ttcp \tnowait \troot \t/usr/sbin/pop3d pop3d -i"
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