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You are correct about the domain registration and MX records. First you need to register a domain name. Second, create a host record that points to the IP address of your mail server (or appliance or service that will be receiving messages for you) and third, create a MX record that points to the host record you just created.
Exchange Server 2003 is configured to receive mail out-of-the-box. However, it will create a default policy that matches the domain name of the Active Directory domain. If your AD domain matches your Internet domain name, you're all set.
However, if the two are different, you'll need to modify the default recipient policy to also include the Internet-based domain name. You'll also want to configure the policy so that the primary email address matches the Internet domain name. Finally, apply the updated policy to user accounts so they all receive the changes.
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