[Dovecot] ldap quota limitation problem

hi there

i have a such problem:

in dovecot.conf ... protocol imap { listen = *:143 ssl_listen = *:993 mail_plugins = quota imap_quota } ...

quota = dirsize:storage=10240

...

in dovecot-ldap.conf: ... user_attrs = uid,,,uid,uidNumber,gidNumber,boxQuota=quota=dirsize:storage ...

when an user try to answer out from overquoted box he got the message
"overquota blahblahblah", BUT the message still goes... it seems that the imap_quota worked (report about the overquota) but
plugin quota dont work.

in dovecot logs : ... Sep 14 09:10:23 xxxxxxxxxxx dovecot: IMAP(test4): dirsize quota limit =
1000kB ... but in user maildir/maildirsize: 0S,0C 1179466 16 1248 1

what it can be?

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