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Installed new Exchange 2003 in domain with existing Exchange 2000. Now only one way emails flow

I've installed Installed new Exchange 2003 in Win 2000 domain with existing exchange 2000.  Everything went well.

I've successfully moved one mailbox over to the new 2003 server as a test.

Using the moved email account I can send and receive emails  to external sources.

I can receive emails from users' who's mailboxes still reside on the 2000 box.  But emails send from this account is never received by the recipients on the 2000 box.


I'm wondering if there is a some sort of relationship which needs to enabled for this to work.

Please advise.

-New to the Exchange Admin world.

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PLA_LTM
Asked:
PLA_LTM
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2 Solutions
 
isaman07Commented:
If he is still using the address autocomplete option of outlook, it will not work. Try typing the address of a user still on the  2000 box completely manualy and try, if it works then you need to delete the .nlk file from his machine.
Keep me posted.
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PLA_LTMAuthor Commented:
This user is not using auto complete.  
I've tried to type out the name of user on the 2000 and tried selecting a name from global address list.

Still did not work.

No NDR is received by the 2003 user.
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PLA_LTMAuthor Commented:
Once  I added the IP address of each server to the  Connections section of  PROTPCOL>SMTP>Default SMTP Virtual Server.

This seemed to resolve the issue.
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