I have a single exchange2007sp1 server. I have 3 different domains that need to send email from this server. AAA.com BBB.com CCC.com The way i have it is simply with aliases. Every users has all 3 addresses. I simply set each users Primary email address in the properties page. Is this the correct way to setup multiple domains on one exchange system?

Yes. Just make sure you also configure the "accepted domains". Read here for more info: http://msexchangeteam.com/archive/2006/11/16/431531.aspx

Hi, You've got the right way! Meanwhile I would like to share more information with you: Planning for a Large Exchange Organization http://technet.microsoft.com/en-us/library/bb123567(EXCHG.80).aspx Hope it helps. Xiu