Routing email from Exchange 2003 to Exchange 2007, 2 domains, 1 LAN

Part 1: We have SBS2008/Exchange 2007 in one domain and Exchange 2003 in another domain, both domains on the same LAN/subnet. How can I route email from the Exchange 2003 box to be delivered directly to the Exchange 2007 box without sending via the internet?

Part 2: Can I achieve the above for certain email addresses/domains only e.g. route emails to (in the CC: field) directly from Exchange 2003 to Exchange 2007 on the LAN, but still allow emails to (in the TO: field) to go out over the internet.
Who is Participating?
Neil RussellConnect With a Mentor Technical Development LeadCommented:
Use the following  to create a new receive connector that allows Anonymous connections ONLY from the other exchange server.
Neil RussellTechnical Development LeadCommented:
1)You just need to create a send connector for the other domain on on the 2003 box and out the ip of the 2007 box as the smart relay address
drl1Author Commented:
Thanks for the tip. Can you provide a little more detail to guide me on the steps involved. It sounds straight forward!
drl1Author Commented:
I have done as you suggest however as the two Exchange servers are in different domains I get the following error message when attempting to route email through the new connector.

smtp;530 5.7.1 Client was not authenticated

How can I configure the Exchange 2007 server to 'trust' or accept messages from the Exchange 2003 server which is in a different domain.
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