Question : How do I create a subdomain email address?

I have SBS 2003 running Exchange.  I have emails setup from our main domain (for example, [email protected]).  I need to setup new users on subdomain accounts for email only access ([email protected]).  What do I need to do to create the subdomain and allow subdomain emails to be created.

Answer : How do I create a subdomain email address?

Sean outlines how to host multiple domains in the following link. You can treat the subdomain in this case as a second domain.
http://sbs.seandaniel.com/2004/10/hosting-multiple-domains-on-sbs-2003.html