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Exchange 2013 sp1 internal email flow

Posted on 2014-12-05
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Last Modified: 2014-12-14
We recently migrated our Exchange 2007 to Exchange 2013 sp1.  Since then we've noticed something.

It appears all is flowing to the outside and coming back in.  How do I configure Exchange 2013 to ensure if I'm sending an internal email, it stays inside our environment and not hitting public DNS then coming back in?  Because of this internal only email boxes are not working anymore.
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Question by:BMFC
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Expert Comment

by:Rajitha Chimmani
ID: 40483004
You must add your internal email domain as authoritative in the Accepted domains. Once added, all emails addressed to internal users will be tried for delivery within Exchange organization
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Expert Comment

by:R--R
ID: 40483058
All the mailboxes are located in Exchange 2013? Are both the exchange servers on different sties?
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Author Comment

by:BMFC
ID: 40487624
The Exchange 2007 server has been taken offline.  All mailboxes have been moved to Exchange 2013.

On the "accepted domains" tab in EAC, I see one line that has our domain listed as "Authoritative".  We initially noticed this issue because group email boxes are set to receive from only internal email addresses, so they stopped working.  Actually, if I send an email from my Outlook client to a group email address, it works.  If we try to send an email from a server via a monitoring process or something else, it doesn't work.  If I allow these group email boxes to receive from external, they work.

Not sure if this is related, but I do see an error in the log when trying to send from one of our servers to an external email address, (gmail.com) account.

Mailbox unavailable. The server response was: 5.7.1 Unable to relay

Obviously, something isn't configured correctly.
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Author Comment

by:BMFC
ID: 40487759
Something else i just noticed.  By default, Exchange 2013 creates a FrontEndTransport role receive connector that is listening on port 25.  I came and added a HubTransport role for routing email from servers, etc. also on port 25.  I'm assuming this isn't allowed.

What is the recommended way to allow Exchange to relay messages from other IPs?
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Accepted Solution

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BMFC earned 0 total points
ID: 40488860
Resolved. Deleted hubtransport connector listening on port 25.  Modified FrontEnd connector listening on port 25.
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Author Closing Comment

by:BMFC
ID: 40498690
Resolved own issue.
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