troubleshooting Question

Exchange 2003/Exchange 2010 coexistence mail flow

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confusionmakerFlag for United States of America asked on
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We are in the process of migrating our email from Exchange 2003 to Exchange 2010.  We currently have 3 Exchange 2003 servers.

Exchange 2003 setup:
Server 1 - Primary mailbox server.  Internet mail passes through this server to a smarthost.
Server 2 - OWA server.  We also host an email marketing application that sends marketing emails thru this server, bypassing the smart host.
Server 3 - Gateway for a Groupwise email system. (Not concerned with this at the moment.)

We recently installed the CAS and Hub Transport roles into our environment on a single server.  Everything is working, internal mail is flowing, external mail is flowing.  However, all mail is now passing through the 2010 Hub Transport server.  We were under the impression that during coexistence, Ex2003 mail flow would not be changed.  

This has not stopped mail flow, however the HT role has been configured to go through the smarthost.  The problem we are running into is when an email marketing campaign is submitted, our regular internet mail is delayed in the queue waiting for the campaign to finish.  We would like to see the email marketing campaigns continue to pass through the Ex2003 server for the time being.  The email marketing software is configured to use the Ex2003 as its smtp server, but mail still passes through Ex2010 HT.  Is there a way we can force mail through Ex2003 for the time being?

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