This is the Lists → Forwarding → Forwarding Tab

The Forwarding Forwarding tab lets you define the email address which messages to this Forwarding list will be distributed to. You can only specify a single email address here. If you wish to use more, then change the list type to a Distribution List. (In VPOP3, a Forwarding is just a special case of a Distribution List where there is just one list member).

The Forwarding Address is the email address where messages to this List will be forwarded to. It can be a local or remote email address.