This file is indexed.

postrm is in qmail-run 2.0.2.

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

test "$1" != 'purge' ||
  exec rm -rf /etc/qmail/qmail-smtpd /etc/qmail/qmail-send \
    /etc/qmail/tcp.smtp.cdb

test "$1" = 'remove' || exit 0

update-service --remove /etc/qmail/qmail-send || :
update-service --remove /etc/qmail/qmail-smtpd || :
update-service --remove /etc/qmail/qmail-verify || :