I have been reading about Exchange Internal-Relay domains and have a quick question. Lets say i have an Internal-Relay domain. There are email addresses that exist in the GAL but their mailboxes are on a different Exchange server.
- If the servers receives a message for an address that exists in the GAL and has a local mbox, it delivers it locally
- if it receives a message for an address that exists in the GAL but doesn't have a local mbox, it relays (send connector) to another server.
- If it receives a message for an unknown address (not in GAL)... what happens? Does it bounce it (NDR) or does it relay it to the Send Connector?