SBS: Accepting mail for multiple domains

When a customer claimed that one of our competitors (who we were bidding against us for a project) informed them that one of the downsides of using SBS was that you couldn’t host email for multiple domains, we needed to explain to the customer (gently) that in fact you could add multiple domains to SBS without issue. Contained below is a procedure for doing just that.

For Exchange 2000/2003, and SBS 2000/2003

1) Open Exchange System Manager
2) Expand Recipient Policies, and right-click on the Default Policy
3) Select the “E-Mail Addresses (Policy)” tab
4) Click the “New” button, select “SMTP Address” and click ok.
5) In the “Address:” field, type “@yourdomain.com”, leaving checked the checkbox indicating that “This exchange organization is responsible for all mail delivery to this address” (Click here for more information on authoritative and non-authoritative domains).
6) If this is going to be your new primary domain, you can choose to “Set as Primary”.

Finally, keep in mind that if you’re adding a new domain, you need to add an appropriate MX record for this new domain to DNS (typically done though an administrative interface, provided by your registrar or web host).