I have successfully installed ISPConfig3 on a Debian 5.0 system.
Tried to use mailman with it, but without success. The error I constantly get is
Recipient address rejected: User unknown in virtual mailbox table
I followed several instructions on how to make ISPConfig (and postfix, in particular) and mailman to work together, but it just doesn't work.
Now I thought to switch from postfix to exim (and mysql; had this with ISPConfig2).
Is this possible at all?