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Exch 2003 emails not sending to Exch 2007

Posted on 2014-11-28
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I have just installed an Exchange 2007SP3 server (don't ask why Exch 2007) into our Exch 2003 environment.  I can send messages from a mailbox I moved onto the Exch 2007 system to users on the Exch 2003 but I cannot get messages to go from the 2003 server users to the 2007.  They sit in the Routing Group Connector that got installed during the installation of Exchange 2007.  Thanks in advance for your assistance...
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Question by:kevincavanagh
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Simon Butler (Sembee) earned 500 total points
ID: 40470968
Primary reason for this a smart host on the SMTP virtual server on Exchange 2003. If you have one set there, remove it and put the smart host on an SMTP connector.
It isn't unusual for the RGC to not create correctly, so removing it (from Exchange 2007 using remove-routinggroupconnector) and then recreating it will fix that problem.

Also ensure that any AV software on the server is not blocking the connection - some software can take exception to local network SMTP connections.

Simon.
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by:kevincavanagh
ID: 40471035
Thanks for your response.  It looks like Exchange 2007 created two RGCs, one for the 2007 Exchange and one for the 2003 Exchange that I can see on the Exchange 2007 console.  Should I remove both them?  Also, I have smarthosts on the SMTP virtual server but they deliver mail to outside domains that we have had problems sending to in the past.  I presume you do not mean to remove those.  What should I do in that scenario?  I am just currently interested in routing email internally back and forth between the Exchange 2007 and Exchange 2003 servers...thanks.
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by:Simon Butler (Sembee)
ID: 40471641
"Also, I have smarthosts on the SMTP virtual server but they deliver mail to outside domains that we have had problems sending to in the past.  I presume you do not mean to remove those"

Yes I do. You MUST remove them. You cannot have a smart host on the SMTP virtual server for email to work correctly.

If you need to use a smart host for delivery then configure that on an SMTP Connector, and a Send Connector on the Exchange 2007 server.

Simon.
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by:kevincavanagh
ID: 40477151
I misspoke in my previous entry.  I do not have smarthosts on the SMTP virtual server but do have SMTP connectors with SmartHosts configured in them.  Let me know if you can think of anything else...thanks.
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by:Simon Butler (Sembee)
Simon Butler (Sembee) earned 500 total points
ID: 40484468
You need to ensure that the FQDN on the SMTP virtual server matches the real FQDN of the Exchange server.
The FQDN on the receive connectors of the new server must also match the server's real name.
No external DNS server should be configured on the SMTP virtual server - if you have them, remove them.
Basically you want the SMTP virtual server as close to the default as you can.

Simon.
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by:kevincavanagh
ID: 40494503
I'll have time to check this later in the week and I'll let you know...thanks for your assistance.
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