This file is indexed.

postinst is in dovecot-pop3d 1:2.2.13-12~deb8u4.

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.

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#!/bin/sh

set -e

if [ "$1" = "configure" ]; then
  CONFFILES="conf.d/20-pop3.conf"

  for conffile in $CONFFILES ; do
    # Tell ucf that the file in /usr/share/dovecot is the latest
    # maintainer version, and let it handle how to manage the real
    # configuration file in /etc/dovecot.
    ucf --three-way --debconf-ok /usr/share/dovecot/$conffile /etc/dovecot/$conffile
    ucfr dovecot-pop3d /etc/dovecot/$conffile
  done

  echo 'protocols = $protocols pop3' > /usr/share/dovecot/protocols.d/pop3d.protocol
fi