LOSTQUOTA: unable to remove quota root

[subscriptions at keenondots.com]

Hello all,

For a particular domain, that has a near 4GB quota (4000MB to be exact), the quota is lost several times a day. The client is currently moving a lot of e-mail around.

The imapd.log says:

Oct 31 hh:mm:ss mailstore1 imap[nnnn]: LOSTQUOTA: unable to remove quota root domain.tld! for domain.tld!: Mailbox does not exist

The mailbox does exists, that is: it works fine. We are using @-style virtual domains in 2.2.12 with unixhierarchysep: yes.

Any clues?

TIA
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