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Working with Multiple (Email) Domains
Author: Simon Butler, Exchange MVP, MCSE

Exchange can easily handle multiple email domains. However once you introduce a second domain to the Exchange server, things can get complicated. This section of our web site provides links to the articles on how to work with multiple email domains.

Two Domains One User
How to manage the requirement for a single user to be able to send emails coming from two different email domains

Two Domains and Two Users
How to manage having two users who both want the email address joe@ but on two different email domains that are hosted on the same domain.

Backup SMTP MX Records
How to use your Exchange server to provide a backup SMTP MX record for another domain.