Exchange 2007 mailbox server with Exchange 2003 Front End?

I have installed a new Exchange 2007 mailbox server to do some testing.  I can send\receive internal emails, as well as recieve external emails on a test account on this new server.  However, I cannot send emails to external accounts.  I do not get any error messages back.

My question is:  Is Exchange 2007 mailbox server compatible with an Exchange 2003 Front End?
brett_apfcAsked:
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gupnitCommented:
Hi,
In Exchange 2007 create a Send Receive Connector for the Smart Host (I would doubt ur Msx 2003 front end is sending out mails, verify that, if oyu have any smart host configured)
2003 and 2007 are compatible :-), thats why you could install 2007 in same 2003 organization ;-) !
http://www.petri.co.il/configuring-exchange-2007-send-external-email.htm
Thanks
Nitin
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brett_apfcAuthor Commented:
We currently do have a smart host configured on our back end Msx 2003 servers pointing to our Front End.

Thank you very much for the link.  That looks like exactly what I needed.  I'll reply back once I've created the Send Connector.

thanks!
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brett_apfcAuthor Commented:
I've created a send connector with the following settings:

Address Space type:  SMTP
Address:  *
Route mail through smart host:  FQDN of Exchange 2003 Front End
Authentication:  None (I believe this is how the other back end servers are set.)
Source Server:  local Exchange 2007 server

Still no luck sending external email.  Message tracking is showing the emails, but the send connector is not picking them up and relaying them to the front end server.

Am I missing something?

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brett_apfcAuthor Commented:
Doh!  Restarted the Exchange services, and all is well.

Thank you for your help!
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gupnitCommented:
Good to know you sorted it out...Glad to be of help :-) !
Cheers
Nitin
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