I'm looking into adding a second email domain here and I wanted to make sure I know all the steps involved with Exchange before I do. Forget the Firewall and registration of the DNS..lets assume all that is done. If i wanted to configure my exchange to accept a new mailDomain and I wanted my users to be able to receive mail on both domains. Do i simply run exchange system manager, go to receipients policies and add the SMTP domain? Is it that simple in exchange? What about my user config? DO i need to add the smtp email address to each of their account properties? Help me out, I've only ever done it with domino.

It's pretty simple in Exchange, it just depends on how you plan to use the additional SMTP domain. Start by reading these articles: http://support.microsoft.com/kb/q289833 http://support.microsoft.com/kb/q260973