Diskquota per mailbox ?

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Courier can also be used for quota. But it's also very complicated there. The maildirsize must be set during maildir creation. Then postfix needs to be patched with vda-softquota to correctly deliver mails with quota limitations. IIRC also maildrop must be use for mail delivery to update the quota when mail arrives. All in all, I could compile my findings into a patch (SQL is already there and useable for dovecot too).

A VERY BIG BUT(T): Dovecot has many great features (for me sieve) and quota is so much better (postfix can use dovecot for delivery), indexing is CPU saving... so I guess we have to find an upgrade path to use dovecot.

my 2 cents...