postinst is in courier-authlib 0.68.0-4build1.
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 | #!/bin/sh
set -e
if [ "$1" = "configure" ]; then
# create courier user and group
if ! getent passwd courier > /dev/null; then
adduser --quiet --system --group --no-create-home --home /var/lib/courier courier
fi
fi
exit 0
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