A 'Forwarding' is a special case of a Distribution List which just has a single member.
If you create a Forwarding called "joe" with a Forwarding Address of "bob@example.com", then any messages sent to the address joe@<local domain> will be forwarded on to bob@example.com.
You can also forward messages using the Routing tab in a user's settings, but that way uses a user licence, whereas using a Forwarding doesn't.
For details on the setting tabs, see the sections below:
