Trash - Delete All

Trash - Delete All

We use 6 inbox shared (via IMAP). The Trash bin contains a lot of messages.
  1. Is it possible to delete them all permanently?
  2. Is there a rule to empty trash bin after xx days?
  3. Deleted permanently message in TeamInBox are deleted permanently in the related e-mail account. BUT, message permanently deleted from the e-mail account are still in the trash bin of TeamInBox. Is it "normal"?
Eleonora