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SBS 2011 Exchange 2010 Can I have exchange handle mail for 2 different domains? How?

I remember this discussion years ago with older versions of SBS, but I'll post it here for the most timely opinions.

A business has SBS 2011 with exchange 2010.  They have their mail ____@a.com  and the local domain is a.local.

We want to be able to host the mail for b.com also, another domain we bought / have full access to DNS, etc.

There's only 2 accounts that would use that b.com domain.  A mailbox for user bob@b.com and a forwarder info@b.com that would forward to steve@a.com and mike@a.com

Any issues with doing this?  Is it complicated?  Any links to a clear step by step process?

2 Solutions
David AtkinTechnical DirectorCommented:

Yes this is possible.

You would do this by adding an Accepted Domain.

The below article shows how to do this and explains what everything is:

The Basic process is:

1) Open the Exchange Management Console
2) Expand Organization Configuration> Hub Transport
3) On the right hand side, select New Accepted Domain.

When adding new users you would give them an additional alias and if needed remove the default a.com address.

Your MX Records will need pointing at the server as your current domain.
Adam BrownSr Solutions ArchitectCommented:
Yes, it's actually pretty easy to do. Open the Exchange Management Console, go to Organization Management, then Hub Transport and go to the Accepted domains tab (I'm going on memory here, so it may be in a different location in the console. Look for Accepted Domains tabs if it isn't there). Then just add a new domain, enter b.com, then add MX records in the public DNS for b.com that point to the same address as those set for A.com. Once the domain is added, you can then add it as an email address on any object in exchange.

For your forwarder, you would create a distribution group with an email address of info@b.com, then add steve@a.com and mike@a.com to the group.
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