preinst is in qmail-uids-gids 1.06-5.
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 | #!/bin/sh
set -e
test "$1" = 'upgrade' || exit 0
dpkg --compare-versions "$2" lt 1.06 || exit 0
cat >&2 <<-EOT
Upgrading qmail-uids-gids from version $2 is not yet supported.
EOT
exit 1
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