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Mail flow from Exchange 2013 to 2010 for specific domain (two sites)

Posted on 2014-03-13
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Last Modified: 2014-03-17
We have two sites joined by a site-to-site VPN tunnel. Site A contains a Exchange 2013 server and site B a Exchange 2010 server. What we want to do is send mail from site A to a domain hosted on the Exchange server in site B through the VPN tunnel.
What we did is create a send connector for this domain on the Exchange 2013 (in site A) server and added the IP address of the Exchange 210 server (in site B) as the Smart Host.
On the Exchange 2010 server we created a receive connector which only listens to the internal IP of the Exchange 2013 server. Furthermore we set it to not use a Authentication Mechanism and set Anonymous users as the only Permission Group.

We are able to telnet port 25 from the Exchange server in Site A to the one in Site B, so that part seems to work.

When mails are send to a mail address in the specific domain (using OWA of Telnet) from site A, the mail gets stuck in the Exchange queue on the Exchange 2013 server.
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Question by:Ronny Stijns
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Expert Comment

by:Simon Butler (Sembee)
ID: 39927762
Unless you have the default connectors locked down to specific addresses, there is no need to configure an additional Receive Connector. Therefore if you don't need the connectors to be locked down, delete the connector and use the default instead.

You will need to have the Authentication methods enabled, even though it isn't using them. However if you use the default connector instead, you should find email flows fine.

Simon.
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Author Comment

by:Ronny Stijns
ID: 39928631
Doesn't the default connector use the MX record and therefore the mail flows over the internet instead of the tunnel?
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Simon Butler (Sembee) earned 2000 total points
ID: 39928870
No, you are referring to the SEND Connector, I was referring to the Receive Connector.
You still need the Send Connectors - there is nothing wrong there. However a Receive Connector is just a listener,

Simon.
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Author Comment

by:Ronny Stijns
ID: 39929035
Works! Thank you very much for your help!
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Author Closing Comment

by:Ronny Stijns
ID: 39929037
Worked after implementing the solution.
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Expert Comment

by:Toshky
ID: 39932371
Sorry what was the solution.
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Author Comment

by:Ronny Stijns
ID: 39933656
Using the default receive connector, instead of creating a second one.
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