Directory assistance and mail routing

Anyone have any ideas about the following:

The server(s) where we recieve our external mail is in one Notes domain and the users are in another. The “external” domain has directory assistance configured so it can find the users in the internal domain. I am curious if there is a way to have the External server route mail to the users homeserver directly. The way it works now is that it takes the first connection doc that exist between the external and internal domain and routes it to that server.

Regards

Hans