dovecot - Feb 2008 - 1.0.10 - Can deliver get quotas from users maildirsize?

Hello...

I'm experimenting with controlling users quota by manipulation the
maildirsize files in virtual
users (LDAP) homedirs (Is this OK?). This works with IMAP, but deliver via
postfix delivers mail to
users even if they are over quota. I would like to reject new mails in this
case.

Any ideas?

Thanks,
Tobias