ACL management

[Marco]

Hello,

  uhm, just a trivial question about ACL management. When I delete or 
rename a mailbox, does Cyrus IMAP provide a process to find out all 
orphan permissions and delete them on all other mailboxes rights?

Maybe something like "expire" could be useful, or a process that delete 
all permissions when a mailbox with elsewhere rights has been deleted or 
renamed.

For instance:

# lam user/sharedmailbox at example.com
user1.example.com lrswipkxtecda
user2 at example.com lrswipkxtecda

Well, I delete user1 at example.com. How can I remove the user1 at example.com 
from user/sharedmailbox at example.com rights?

Thank you
Marco