Configure Exchange 2003 as SMTP for Google Apps Business

We have Google Apps for Business and are using it to replace our Exchange server. However, some of our users need to send more than 2000 messages a day sometimes. I wanted to have those few users continue to use the Exchange server for outgoing email. The problem with this is that if they send an email to another domain user, it will go to their domain Inbox rather than Google's. I am keeping their Exchange email accounts active as we migrate.

User 1:
incoming: imap.gmail.com
outgoing: smtp.domain.com

User 2:
incoming: imap.gmail.com
outgoing: smtp.domain.com

User 1 -> User 2: Goes to Exchange Inbox.
User 1 -> External User: Goes outside of the domain to the WAN.

Any ideas?
BCRobertAsked:
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Allen FalconConnect With a Mentor CEO & Pragmatic EvangelistCommented:
Adding your Exchange server as an outbound gateway does not impact the sending limit.  You would also be sending all messages from Gmail to your Exchange server for relay outbound.

To do what you want, you need to setup Dual Delivery with Google Apps Primary:
http://www.google.com/support/a/bin/answer.py?answer=96855

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BCRobertAuthor Commented:
Additionally, can I add our Exchange server as an outbound gateway? Will that bypass the sending limit? I can't find anything that says it does or does not bypass the limit.
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BCRobertAuthor Commented:
I figured that was the case, thanks for the clarification.
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