[Dovecot] vfile ACL's

[Benjamin R. Haskell]

(Sorry for the impatience. This was one of several questions in my email 
from yesterday. I thought I might have better luck being more direct.)

Is there a way to set ACL's, using the vfile backend, on a truly global 
basis? or hierarchically (i.e. .Maildir.Sub inherits from .Maildir)?

The wiki page says:
"The default ACLs for mailboxes is to give owner all permissions and other 
users none. Mailboxes in public namespaces don't have owners, so by 
default no-one can access them."

Is this configurable?

Thanks,
Ben