I have been setting up a redundant mail server with Postfix, Courier and MySQL on Ubuntu 10.04 server 64-bit. After following several guides it's almost complete.
There's just one thing left that bugs me, and that is the location of the users mail folders.
At the moment they are created under "/data/mail/user(at)domain.tld". However, I want to have it a bit more organized so it's easier to keep track when the user number goes up.

How can I change it to be either "/data/mail/domain.tld/user(at)domain.tld" or "/data/mail/domain.tld/user"?

Note that (at) in the path's above is an actual "at'", but the forum won't let me post that until I have 15 posts.