This can be improved in the future, to show some additional information
about each mailbox like:
- "how many users are in that room"
- "which users are in that room"
- "who is the owner of the mailbox"
This can all be done later though.
Checking using `settings.Allowed` is odd. Not all commands are related
to setting configuration settings. Admin commands are coming in the
future, for which this is certainly not the case.
We now do access checks early on (during command processing), so command
handlers can be clean of access checks. If we're inside of a command
handler, the user is privileged to run it.