Originally Posted by olaus
create 20 system-users with 20 password and 20 directories, each with catchall and forwarding to that one account.
This will break the user sheme that is currently used in ISPConfig where the email functions are grouped around the user object. If you code it, it must work with postfix and sendmail.
Also this functionality is already implemented in the ISPConfig 3 source tree so the question is if its worth the time to implemement it for ISPConfig 2 again.