Sending Mail of of 2k7 with existing 2k3 server

I opened this question yesterday and really didn't get resolution, so i did some more testing and have this to offer.  I have a 2k3 server that is currently the main exchange server.  I just installed 2k7 on a fresh box and will be migrating over.  Everything seemed to be set up per technet correctly. the admin groups and routing connectors are set up.  I can send mail from the outside to a mailbox on 2k7 and i can recieve it. But i can't reply.  So mail is not going out of the 2k7 box through 2k3 like it should.  Where can i begin to look for issues?  Do i have to create a send connector on 2k7?
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jasonmichelAsked:
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MrLonandBCommented:
Do you have a Smart Host defined in the SMTP Virtual Server on the 2003 machine? If so, remove it. If you still need the Smart Host, setup an SMTP connector for it.
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MrLonandBCommented:
Disregard my last post...I read your question wrong. Sorry.
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MrLonandBCommented:
Did you have pre-existing SMTP Connectors on the 2003 machine? If so, the 2007 install should have picked them up. Anyway...

What do you currently have...do you have an SMTP Connector configured for a Smart Host, or just what? Can you tell where the outgoing messages are being stalled...are they in the queues on either machine? And you can send internally from a mailbox on the 2007 machine, just not externally, right?

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jasonmichelAuthor Commented:
i haven't set any smtp connectors up on 2k7.. i can send mail from 2k3 and 2k7 mailboxes internally just fine and i can send from outside into 2k7 just fine..just 2k7 outside that i am having issues..  they are staying in the 2k7 queue..below is one

Identity: BVEXSRV01\Unreachable\37
Subject: RE:
Internet Message ID: <115CE24B695D5E419BD2B76DD00ED0B406285B84@BVEXSRV01.cobnet.cityofbellevue.com>
From Address: exchtest@cityofbellevue.com
Status: Ready
Size (KB): 2
Message Source Name: FromLocal
Source IP: 255.255.255.255
SCL: -1
Date Received: 11/18/2008 2:36:49 PM
Expiration Time: 11/20/2008 2:36:49 PM
Last Error: A matching connector cannot be found to route the external recipient
Queue ID: BVEXSRV01\Unreachable
Recipients:  jaycin0804@yahoo.com
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MrLonandBCommented:
Before you installed 2007, how were you routing your outbound mail...using a SmartHost, DNS...or what? Or let me ask it this way...do you have an SMTP Connector on your 2003 machine?
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jasonmichelAuthor Commented:
i didn't set up the initial 2k3 server..but if i go under the 2k3 server and protocols and smtp i see the default SMTP virtual server..and if i go under the advanced menu of the delivery tab..i don't see a smart host entered..just masquerade domain and FQDN
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MrLonandBCommented:

Take a look at the article below and see if you may have missed something in configuring your EX2007 machine to co-exist with 2003:

http://www.it-training-grote.de/download/msexchange-coexist.pdf
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jasonmichelAuthor Commented:
i figured it out earlier..i just created a send connector on the 2k7 box to route mail using DNS MX thanks for the help though
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