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How do I configure Exchange 2007 to route "some" emails in somedomain.com to an external smtp server, and deliver the others locally?

Posted on 2008-06-18
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Last Modified: 2010-03-06
I have a working exchange 2007 system that hosts several accounts such as username1@domain.com, and username2@domain.com. I have other users on a unix mail system, username3@domain.com and username4@domain.com. Exchange will not let me send email from username1 or username2 to either username3 or username4. It appears that exchange tries to do local delivery for username3 and username4, but obviously doesn't find them. How do I configure exchange to deliver to users it hosts, and then pass on any other usernamex@domain.com emails to the unix host and let it try to deliver them.
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Question by:Hikanthus
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by:tigermatt
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You have to configure Exchange Namespace sharing to share the SMTP namespace for that domain with the other server. This means Exchange no longer thinks it is responsible for the whole namespace and will pass unresolved mail to the other mail server.

Some more information can be found at http://www.msexchange.org/articles_tutorials/exchange-server-2007/planning-architecture/exchange-2007-smtp-namespace-sharing-different-relay-domain-types.html.

-tigermatt
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by:Hikanthus
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well, that seems to work if the mx record for domain.com is pointing to the exchange server, and I am trying to share the namespace with the unix box. The MX record for domain.com is pointing to the unix system, in my case.

-Matt
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Hikanthus earned 0 total points
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okay, I think I figured things out here... I modified my send connector so that it has two smtp address spaces. one for *.domain.com with a cost of 1 and one for *, with a cost of 10. For some reason, this seems to work.

-Matt
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by:tigermatt
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If it's pointing towards the Unix box, then that must also be configured to send mail on to the Exchange Server for unresolved mailboxes. Don't forget that half of the setup!

How is the send connector configured? Is it sending all mail through the unix box?

I guess if that solution works, then you can use that!
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by:Hikanthus
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yes, the unix box already uses .forward files and aliases to send some @domain.com email directly to exchange, and locally deliver the rest that doesn't have .forwards or aliases.

Yes, exchange is set to relay outbound through the unix box, and that is working, for domains other than domain.com.

My only concern now is, have I missed a possible delivery case, or opened something up that is going to cause problems as we roll this out to more and more users... guess time will tell.

-Matt
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by:tigermatt
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From what I can see and without testing myself, it should be OK.
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