[Dovecot] quota with sendmail and dovecot

[Antonio Casado Rodríguez]

I have a problem with dovecot and quotas

I don't want quota in  INBOX with sendmail (mbox), it's work ok. 
Sendmail can put the new messages in INBOX although exceed the quota limit.

I have two namespace in dovecot:
 namespace private {
   separator = /
   inbox = yes
   prefix = "#mbox/"
   location = mbox:/Public/Maildir/%n_mbox_indexes:INBOX=/var/mail/%n
 }
 namespace private {
   separator = /
   prefix = ""
   location = maildir:/Public/Maildir/%n
 }


I have this quota:
plugin {
  quota = maildir:storage=10240
 }

It's work ok, i have 10 MB in INBOX and i have 10 MB in maildir.
My clients are Mozilla Thunderbird

My problem: when Sendmail put one new message in INBOX, Thunderbird see 
it, but the quota don't change.
I think that when dovecot do a full sync it must update the quota.