[Dovecot] Postfix/Dovecot virtual - directory structure

Hi, perhaps I should post this in a Postfix forum but I'll give it a shot: I want my accounts sorted under /home/vmail/[domain]/[username] (and I managed to get Dovecot to look for mail there with %d and %n ), but how do I tell Postfix to sort the mail? I can't figure out how to do it. The virtual_mail_base is /home/vmail/ but there I get a bunch of folders in the form [username]@[domain]. I use mysql for the virtual mailboxes if that matters.

I'll be grateful for any suggestions.

/Johan Folin