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Exchange 2003 - how to route external mail thru 3rd party mail gateway

I have 5 sites in my org all having local Exchange 2003 servers.  All mail comes into the org thru a 3rd party mail gateway (Tumbleweed EMF) and then is forwarded to our corporate headquarter exchange server and then mail is routed from there.  All exchange servers relay outbound mail directly to the internet.  I would like to route mail from our corporate headquarters to our mail gateway.  

I tried using the smart host feature under the SMTP Virtual server, but caused a routing loop with internal mail between exchange servers.  Outbound mail worked, but we need both.

How to I setup exchange to route only outbound mail thru the mail gateway.
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SXCNetworkServices
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SXCNetworkServices
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2 Solutions
 
amaheshwariCommented:
Create a SMTP connector and there you specify Mail Gateway IP in Smart Host as [IP address] and then try checking mails .

Thanks
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SXCNetworkServicesAuthor Commented:
Would that not route all internal and external mail thru this SMTP connector??
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amaheshwariCommented:
Go to Connectors in your ESM, Admin Groups > First Admin Group > Routing Groups > First Routing Group > Connectors and add an SMTP Connector and configure it to use your Smarthost.
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amaheshwariCommented:
No this will only route external mails.

Thanks
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SXCNetworkServicesAuthor Commented:
I just created a SMTP connector and made the one server that I want to route thru the mail gateway the bridgehead.  In the address space tab, there are only the options to include the entire organization or the routing group.  I only want one of the 5 servers to route thru this mail gateway at this time for testing purposes.
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amaheshwariCommented:
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SembeeCommented:
If you configure the smart host directly on the SMTP Virtual server, then all email is sent through the gateway.
If you want to send just outbound email through the gateway, then an SMTP Connector is what you need to use, as it doesn't interfere with the traffic flow.

However the problem is that the SMTP Connector's scope can only be set on a per routing group or per org level.
You could put the servers that you want to test in to their own routing group, then set the SMTP Connector in to that routing group and set its scope to the routing group only.
This may impact on those servers ability to communicate with the other servers, so you will probably have to create a routing group connector.
I would suggest that you look at the relevant white papers from Microsoft, which covers your options in more detail.
http://www.microsoft.com/technet/prodtechnol/exchange/2003/library/default.mspx

Simon.
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