I can't see anything in the manual that explains this sufficiently.
Can anyone enlighten me as to the difference between a Local Domain and a Permitted Domain in the Email -> Email Configuration -> Receiving Email -> Anti-Relay settings screen?
what about the online help of the appliance?
Permitted domain in that section might be a domain that is permitted to relay to outside parties thru the appliance whereas Local Domain is a domain that must be accepted and forwarded to a given host internally (SMTP gateway for example).
That has been my understanding of it, and what best fits what is in the training slides. I would go test it to make sure, but my lab environment is having some issues at the moment.