Exchange 2010 - route email external domain user

I have an SBS 2011 (exchange 2010) server and try to route domain email outside the domain.
Basically sending emails from a@mydomain.com to an external user (outside the domain) to b@mydomain.com. I setup a send connector for the domain to route all emails via a smarthost to the internet. Emails still fail with an undeliverable message user not found.
 "The e-mail address you entered couldn't be found. Please check the recipient's e-mail address and try to resend the message>"

Any ideas what is missing> Cheers
co_olAsked:
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Chris MillardCommented:
Is this user on the same domain as your SBS server?
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co_olAuthor Commented:
yes he is on the same domain.
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Chris MillardCommented:
That means that your Exchange server is trying to route the email internally. So, ideally, what you COULD do, is set up a CONTACT for your user in Active Directory with his primary External Email address (something NOT on your domain). Then, in Exchange, set up his primary account to forward all mail to the contact...
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co_olAuthor Commented:
I have found an easier way to resolve the issue. Change the accepted domain to an internal relay domain which will send all unresolved recipients to a smart host.
Exchange Manager - organisational configuration - hub transport - accepted domain
Change to Internal Relay
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Chris MillardCommented:
Excellent - I'll have to remember that one myself :-)
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co_olAuthor Commented:
no workable replies from other forum members
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