[Dovecot] Allow/disallow mail access based on group membership

I'm just finished FreeBSD/AD integration via Kerberos/LDAP and now I can manage unix users/groups from AD. I want to grant access to IMAP based on user membership in certain group. Is it possible? Can you give me some hints?

Thanks in advance!

-- С уважением, Савчук Тарас ООО "Элантек" : Аутсорсинг ИТ, WEB-разработка http://www.elantech.ru +7 (495) 589 68 81 +7 (926) 575 22 11