[Dovecot] Settings for unlimited quota for some mailboxes

Hello,

I´m using Dovecot 2.0.1 with quota support (quota and imap_quota) which works perfect. However, I´d like to give some mailboxes unlimited quota.

What quota setting (in the backend (SLQ)) is needed to tell Dovecot as LDA that the mailbox has unlimited quota?

0 or NULL or -1 or something else?

Regards Patrick