This may be a simple solution, however I have not yet delt with Exchange on seperated domains. We have recently acquired a company (newco.com) with three sites, 2 in Chicago and 1 in Michigan . Our corporate HQ (corphq.com) is in Dallas. There is an Exchange server at each newco.com location running 2003, and we are running Exchange 2000 (for now) at the corporate office.Currently the newly acquired companies' email is being routed in to one of the Chicago offices, and it is routing mail to the appropriate newco.com location using connectors. This office will be going away in the near future. What we need to do is reroute SMTP mail bound for newco.com to our corporate Dallas office, and forward/relay it to the Michigan location. We will remain on seperate domains for now, however we will have static PTP VPN tunnels between all nodes.I know what needs to happen with DNS to route their mail to our corporate location. My question is, what is best practice for connectors/routing groups in this situation? As I said I am unsure how all of this will work under completely seperate domains/exchange orgs.Any help would be greatly appreciated.Thanks.

With seperate exchange org's, you could just let the dns figure it out unless you are sharing namespace. If so see here: http://technet.microsoft.com/en-us/library/aa997194.aspx You could also use a smarthost to route mail over the VPN from Dallas to MI.