send email through exchange 2003 during transistion to exchange 2007

I am currently upgrading our email system to Exchange 2007 from Exchange 2003.  I have it setup in a single server install in both instances.  I am able to communicate fine and send and receive email using the exchange 2007 server.  However, until I finish testing the installation of 07 I would like to have all my email sent through the 2003 server.  I am having problems with the reverse DNS failing from some external email servers if I send from the 2007 server since I have not switched the DNS to point to it yet.  I also do not want to switch the DNS yet since all the email mailboxes are located on 2003 still and switching the DNS in our case would mess up the outlook web access to those mailboxes.  So back to the original question, of how I can route the mail to leave the company using the exchange 2003 server?  Any help would be great.
Thanks
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Tim LewisNetwork ManagerAsked:
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ThaVWManCommented:
You just need to set up your send connector on the 2007 to route all mail through your exchange 2003 system.  It is under hub transport, and I believe it is the hub transport below the Server Config section.
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ThaVWManCommented:
Sorry, it is under Org Config, Send Connector.  There should be a default one there, and it is just set to use DNS to route the email.  Change that to route the email through a smart host, and point that to your exchange2003 server.  You may have to put settings in your Default SMTP Server on 2003 to allow that system to relay its mail.
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MesthaCommented:
Not quite correct above.
If you want email to go through Exchange 2003 you need to create an SMTP Connector on Exchange 2003. Then set the Exchange 2003 as the bridgehead. Exchange 2007 will see that as a Send Connector that it cannot change.

The simple rule is to use the lowest version to manage during the transition phase. That ensures backwards compatibility.

Simon.
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ThaVWManCommented:
Simon,

Is that still the case when the two servers are not a part of the same exchange org?
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MesthaCommented:
If they are not part of the same org then as far as Exchange is concerned it is relaying through an external server. That means setting up a smart host on a connector and relay settings in the other server.

I saw nothing in the original question to indicate that this was two separate Exchange orgs.

Simon.
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ThaVWManCommented:
I took  "I have it setup in a single server install in both instances" as them being separate orgs.  I could be wrong.  Author, can you clairfy?
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Tim LewisNetwork ManagerAuthor Commented:
It is the same organization, I was just stating that both the exchange 2003 and exchange 2007 are stand alone servers with all roles on one machine.  Thanks for the help.  I will try it out today.
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Tim LewisNetwork ManagerAuthor Commented:
Hello,
I have set the smtp connector on the exchange 2003 server, but i am unsure of what needs to be done to get the organization to use that to send?  Could someone please clarify, sorry for the ignorance.
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ThaVWManCommented:
If you have the connector set up correctly, exchange will use that to send out.  You would need to put a higher cost on the default send connector so that it is not used.
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Tim LewisNetwork ManagerAuthor Commented:
Got it.  Had the wrong address space in the connector on exchange 2003. I thought I was telling what to accept from, to whom to send too.   thanks for the help.
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