Force routing between storage groups in Exchange 2007

incesupport
incesupport used Ask the Experts™
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I need to be able to force emails to and from one particular storage group in our Exchange 2007 (sp3) organisation over SMTP to our external smarthost who will then immediately relay the email back into our organisation.   We have a single domain with a single Exchange organisation with one single SMTP suffix.

We need to ensure that header information for emails to and from this particular SG have a complete inbound SMTP header and are processed by our external smarthost's antivirus/malware/antispam algorithms.

From a user point of view, mailboxes on either side of this connector will continue to use Outlook in the normal manner for internal recipients and the process should be completely transparent (i.e they will not be forced to use SMTP addresses to email their colleagues and all users should continue to have the same email suffix and primary email address).  Other emails not involving this particular storage group should continue to be processed in the usual manner.

Does anyone have any idea of a mechanism on how we might achieve this?

Hope someone can help with this slightly odd request.
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Rick FeeMessaging Engineer - Disaster Recovery Engineer

Commented:
I don't think this is possible...because if you are sending from john@domain.com to sue@domain.com exchange will see this email address and the hub servers will route it.    I was thinking if you need to do something in the header you can setup a transport rule to add a vaule to the header, but there is still the processing of the email by the smarthost.

Author

Commented:
Hi EndureKona,

Thank you for the reply.
If we were to give all the users in this one particular OU a seperate domain suffix for their email address, would this open up any possibilities?  I still think Exchange would get smart and route it internally thus not giving us what we want.

Cheers,
Richard
Messaging Engineer - Disaster Recovery Engineer
Commented:
Unfortuntally no...because if you sent to john@domain.com to sue@domain1.com and set domain1.com as external relay, exchange will still see john@domain.com within the GAL and sent to it.    
I think they only way would be to break off a different domain with Exchange which can be a one server.    I will think about it a bit today...or someone comes along with a better idea.
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Author

Commented:
Nice one, I suspected that this would be a bit of an odd configuration.
Ironically someone jokingly mentioned SBS in the meeting which does sound a bit like a seperate Exchange server running on a DC, unfortunately, this would be a no goer.
Rick FeeMessaging Engineer - Disaster Recovery Engineer

Commented:
Well you wouldn't need SBS or complete different domain.   This would just be a resource domain that would be a DC and Exchange.    The users workstations can still be connected to the orginal domain only the users Outlook is connected to this resource domain.
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This question has been classified as abandoned and is being closed as part of the Cleanup Program. See my comment at the end of the question for more details.

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