FAQ / Routing for local delivery / Q0403
Q0403
Question
How do I configure Exim to send messages for unknown local users to a central server?
Answer
Assuming you are using something like the default configuration, where local users are processed by the later routers, you should add the following router at the end:
unknown: driver = manualroute transport = remote_smtp route_list = * server.host.name no_verify
However, you should if possible try to verify that the user is known on the central server before accepting the message in the first place. This can be done by making use of Exim's “call forward” facility.
FAQ / Routing for local delivery / Q0403