IMAP ACLs for groups

[Chris]

Dear All,

is there any way to assign POSIX groups to Dovecot IMAP-ACLs?

I've tried that today, but I could only open a public folder when my
username was listed in the ACL. A group didn't work.

How do you manage ACLs for intenseley used public folders with many users?
What backend do you use for user management and ACLs?

Is there any way to extend permissions? Are there any scripts available
that set permissions or grant them when logging in?


- Chris