I am not a networking expert, however I've been given a lot of networking responsibilities due to some staff problems...anyway....
We just purchased a new SBS 2003 server to replace an old NT / Server 2003 (domain trust) and Exchange 2000 rig. The domain for the headquaters of the company is, say : ab.com. We have 2 divisions of ab.com.
a.com and b.com.
Some users work for a.com and other users work for b.com. Some users work for both a.com and b.com. I need 1 exchange server with 1 pdc aka SBS 2003 to handle all three domains. Specifically the mail from a.com and b.com. ab.com mail is not important.
Some users need outlook setup with both email from a.com and b.com and when mail is sent out it is very important that it appears to be coming from a.com or b.com depending on the users preference.
I do not want to use 3rd party solutions.
I will setup "gateway" linux servers if need be. I am much better in linux, but not I'm definatley not an expert.
How can I accomplish this goal. Just lay it out for me, no specifics needed. :)