Exchange 2003 Undeliverable message for an email address on the same server

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Exchange 2003
Exchange 2003 error messages
Exchange 2003 SP2
Non-Delivery Reports
Outlook
Outlook 2003
I was hoping someone could shed some light on this. A local user sent an email to another local user and got an undeliverable message with the error below:
The following Recipient(s) could not be reached:
  User on 1/21/2009 3:40 PM
    Your mail system could not find a way to successfully communicate with the destination system.  Please notify your administrator.
    <SERVERNAME #5.5.2 smtp;502 5.5.2 Error: command not recognized>
I'm not sure why they got that error, and the strange part is the recipient says they she recieved the email. We are using Exchange 2003 SP2 and the email was sent with Outlook 2003.
ASKED: January 22, 2009  12:00 AM
UPDATED: January 22, 2009  8:14 PM

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Every once in a while I see this issue when someone is using cached mode and for some reason the offline address book on their pc outlook client is not synching properly. Check their outlook for synch issues. You may also see offline address book errors on the exchange server where their mailbox is located. Take the outlook client off cached mode and have them try again to confirm issue. They can delete the OAB file and do a send/receive which will rebuild it. But if they are having synch issues you will need to help them resolve those.

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  • mshen
    Thanks that explains things. A co-worker recently setup email forwarding on the account, so the sender's un-updated GAL must have caused it.
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