Exchange 2010 Authoritative domain mailbox setup that is not the default

We have added multiple authoritative domains to our Exchange environment. How does one set up a mailbox that is not the default domain? I am able to accept mail at any of the authoritative domains as long as it points to a default domain mailbox but I am at a loss on how to configure a mailbox that can send and receive on one of the other authoritative domains outside of AD. Is this possible?
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Simon Butler (Sembee)ConsultantCommented:
You have two parts to email address management.
The accepted domain list, which just tells Exchange what it will accept email for, and the email address policy, which can set email addresses on accounts automatically.

However there is nothing to stop you from adjusting the properties of the user account manually after creation, adding an address in to the account from one of the other domains. As long as the domain is in the Accepted Domain list, then Exchange will know what to do with it.

Will SzymkowskiSenior Solution ArchitectCommented:
For what you are asking for Specifically is a EAP (Email Address Policy). You can modify specific mailboxes and remove the "update using default email address policy" but this becomes messy and this is not automated.

What you need to do is the following..
- create the accepted domain (which you have already done)
- now you need to create a new Email Address Policy
- While you are creating this policy make sure that you reference the accepted domain you created prior.
- You then also set a criteria, for this Email Address Policy, meaning you can apply this policy to mailboxes in a specific OU, or Mailboxes that have a specific CustomAttribute or a default attribute like Department.

So for example if you have a department called "other domain" you can have your Email Address Policy setup for this new accepted domain to enable the policy on all mailboxes which have "other domain" in the Department attribute.

This is a completely automatic process but like I said you don't have to do it this way you can also do it based on the OU as well as an example.


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