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Jon SnydermanFlag for United States of America

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Controlling outbound mail flow by server

We are new to this client and the previous provider set up three exchange servers for different purposes.    2 for delivery of bulk mail (they send subscribed advertising) and one more for the internal users.   Each is a mailbox server and a hub transport server.   They are each NAT'd to their own external IP in order to protect the users' server from the blocks that happen on the bulk servers.    
The problem is that the outbound delivery does not work like that and all hub servers are automatically distributed and users email is being sent by the bulk servers (and then getting blocked).  
What is the best way to fix this without adding additional servers as edge servers?  Is there a way?

Thanks in advance
~Jon
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Will Szymkowski
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The simple answer is no. Exchange is designed to work together with other Exchange servers that are within the same domain.

So if you do not want Exchange servers to not communicate this way they need to be in a separate network/domain.

Will.
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Thanks Will.   Follow up idea.   If I break the business location in to multiple AD sites and then put the bulk mailers in that new site, would that keep the user server from utilizing the bulk mailer's hub server role?

I realized after posting that even adding edge servers would not help because I still cant depend on which hub it comes from, right?

Thanks!
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Will Szymkowski
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What version of Exchange are you running?
They are running 2007 right now, VERY long story, but they were on 2000, now 2007, soon migrating to 2013+
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Thanks Guy.   This helps a lot and was sort of what we were seeing.   The customer sends 50K+ emails a day and is concerned that the volume may trigger a failover to another site also.   Please with going toward 2013, your other point becomes an even bigger problem.

I think that we are going to rebuild one exchange server as a redundant server to the user server and put the undeliverables mailbox there.   Then take the third server and rebuild it with a software package specifically geared towards accomplishing this goal.   I think that may be a better use of resources.
Unless there are any other ideas, thanks for everyone's input.