postrm is in qmail-uids-gids 1.06-6.
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 | #!/bin/sh
set -e
test "$1" = 'purge' || exit 0
cat <<EOT
Attention:
Purging this package does not remove the qmail uids and gids. You might
want to do this manually, e.g.:
# userdel alias
# userdel qmaild
# userdel qmaill
# userdel qmailp
# userdel qmailq
# userdel qmailr
# userdel qmails
# groupdel qmail
# groupdel nofiles
EOT
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