Exchange sending interoffice emails to smarthost

Hope this is an easy one.  We have a fairly simple setup - 1 domain, 1 Exchange 2010 server.  Our internal domain let's call  Our email addresses however are all  So when one internal user emails another internal user, its sent through the smarthost.  This causes a delay and occasionally an interoffice email caught by our ISP's spam filter.  What do I need to change on the Exchange 2010 server so it knows its responsible for instead of just
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Simon Butler (Sembee)ConsultantCommented:
You should have the domain listed in the Accepted Domains list.
Is it listed? If so, which option is it set to?

pcservneAuthor Commented:
Yes, both and are listed.  For, the settings are:  Type-Internal Relay and Default-True.  Should it be Authoritative? is set to Authoritative and False.

Simon Butler (Sembee)ConsultantCommented:
If you don't have any external mailboxes outside of Exchange then it should be authoritive.
Then Exchange treats it all as internal only.


Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today

From novice to tech pro — start learning today.