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How to configure send connector in Exchange 2007 to route back through Exchange 2003?

Posted on 2008-10-13
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Last Modified: 2012-05-05
Our Exchange environment consists of Exchange 2003 and Exchange 2007; we are in the transition phase.  Users with mailboxes on Exchange 2003 can send and receive internal and external email, including mail from users with mailboxes on Exchange 2007.  Users on 2007 can send to and receive from users on 2003.  The users on Exchange 2007 can also receive external mail but they cannot send external mail.  Messages that are sitting in the queue have an error of:  A matching connector cannot be found to route the external recipient.

Currently there are no send connectors set on the Exchange 2007 server and Im hoping that someone could explain how to configure the Send Connector to route external mail so that it goes through the Exchange 2003 server?  Perhaps this isnt necessary?

Im fairly new to Exchange so any assistance would be much appreciated.
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Question by:Twister_lgg
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Expert Comment

by:gupnit
ID: 22705435
Hi,
You do not need a Send Connector on Exchange 2007 till the time you SMTP Connector on Exchange 2003 that is taking care of External Mail.
Make sure that all Mails being routed from Exchange 2007 goto Routing Group Connector that has been created between 2007 and 2003.
Verify:::: http://technet.microsoft.com/en-us/library/aa997292(EXCHG.80).aspx
Thanks
Nitin
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by:gupnit
ID: 22705447
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Author Comment

by:Twister_lgg
ID: 22706480
So, I dont need to explicitly set up a send connector on my Exchange 2007 until I decommission the Exchange 2003; correct?  

How would I verify that mail is being routed via the RoutingGroupConnector?
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Expert Comment

by:gupnit
ID: 22706618
See if you want to send mails via Exchange 2007, then it can be configured and mails pushed to Smart Host.
It is your call, I am not aware of your setup, hence my suggestion is that if you are contonuing with Exchange 2003 for external mails, then on Exchange 2007 you do not need the Send Connectors.
Routing Group Connector would take care of pushing all mails (External/Internal to 2003 users).
Hope this helps
Thanks
Nitin
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Accepted Solution

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Twister_lgg earned 0 total points
ID: 22722715
Thank you for your response gupnit, however none of the solutions provided actually solved my dilemma of the Exchange 2007 users not being able to send email externally through Exchange 2003.  I ended up calling Microsoft for assistance.

From the EMC under Organization Configuration, Hub Transport, Send Connectors, no send connectors were listed.  Creating SMTP send connectors here in the EMC resulted in E2K7 attempting to route mail externally, not through E2K3.  

Microsofts resolution was to create a SMTP connector in ESM on the E2K3 system instead of the EMC on E2K7.  Create a new SMTP Connector under First Administrative Group, First Routing Group, Connectors folder.  When setting up the SMTP Connector, use the E2K3 server as the bridgehead, set the address space to SMTP, *, 1 and make it available to the entire organization. Then, from the command line, iisreset.  This resolved my issue.  The newly created SMTP Connector now appeared in the EMC on E2K7 and users on E2K7 were now able to send email externally.
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