Routing main for another domain

I’ve had a sudden request to provide mail for about 100 additional “technical” users. These are service guys who normally have no computer access and certainly are not in the Domino Directory.I’m thinking that I can add aonther DNS entry like “companyother.com” and have the domino server redirect mail from this domain to a linux Postfix or Sendmail smtp server and these technical users can use thunderbird or some other mail client.

Can anyone point me in the right direction to do this?

I’m still searching this and the v5 forum for clues but I would be grateful for any help.

Wayne