Mail Routing to an internal domain

I am trying to setup the only Domino server to route mail to an internal server, ie. xx.company.com domain. This domain would receive/send mail to tech mobile units via domino.

Is there a way or what is the way to configure the server documents, as to have the domino server route mail (SMTP, it needs to be converted as such).

Regards,

Pradeep Virk.