Businesses are finding more and more uses for multiple SMTP domain names. Since registering domains is cheap and easy, chances are you'll face setting up multiple domains sometime soon.
Follow these steps to set up multiple domains in Exchange 2000:
When you click OK, the following message appears:
Address generation for <new SMTP domain> has
been enabled for all
newly created Recipients. Do you want to automatically add this
Address Type to all existing Recipient e-mail addresses?
If you want to automatically generate a new SMTP address for all existing users, click Yes. Otherwise, click No so that only newly created users automatically receive the new SMTP address. If you click No, you can manually add the new address to users' mailboxes as needed, or you can create a recipient policy for the users that need the new SMTP address.
To make your change take effect, you'll need to stop and restart the Exchange information store service.
In order for mail to be delivered from the new domains to your Exchange server, you must do some DNS setup. Each domain you host must point its MX record to your Exchange server. If you don't host your own DNS, contact your ISP about making these changes.