EMAIL SYSTEM SYSTEM IS UNKNOWN - using owa

Im desperate.  The General Manager of our company is receiving these error messages when sending emails.  He aparently receives mail ok, but when sending:

The message could not be delivered because the recipient's destination email system is unknown or invalid. Please check the address and try again, or contact your system administrator to verify connectivity to the email system of the recipient.
  <cwp-esp-ex.cwpanama.com #5.1.2>

He uses OWA to connect and work.

From this error message, im lost as how to start troubleshooting. Any help is appreciated.
AKIM_CANTONAsked:
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SembeeCommented:
What is "cwp-esp-ex.cwpanama.com" ?
Is that your server or another server?

The error message usually means what it says - the email address is invalid.
Unfortunately you haven't provided enough information to work with

- does it happen with all emails or just some?
- if not with all, has the addresses that generate the error ever worked?
- does it happen with Outlook, or just OWA?

Simon.
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AKIM_CANTONAuthor Commented:
CWP-ESP.EX.CWPANAMA.COM is our Exchange Server.  

I have just found something interesting:

Emails before the migration, if you reply those, will get the error message.  Looking at the properties of those senders in the original emails i see all information (smtp, etc) is missing.  However, emails after the migration, if you reply, those are ok, because all neede info is there.

This is weird.  Any thoughts?
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SembeeCommented:
So you have recently carried out a migration?

Anything else you have forgotten to mention?

Simon.
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AKIM_CANTONAuthor Commented:
This is basically the story.  We migrated this mailbox from Exchange 5.5 in Barbados to Exchange 2003 in Panama via a simple .pst upload. This happened Friday night.

Now that he is using the email, we found out that in some emails before the migration, when you click the properties of the recipients and senders, there is no emails information at all.  Obviously, when the GM replies those emails, they bounce.

I think there are hundreds of mails with that condition.    

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SembeeCommented:
It would have helped if you explained that in your original question.

I presume that this was a cross-org move? If so, all of the email addresses that the user had before should be treated as non-valid. When the user is working with email received before the move they should hit reply, forward or whatever, then delete the email address from the To: line and reselect it from the GAL.

Simon.
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AKIM_CANTONAuthor Commented:
Yes, it was a cross-org move.  Is that the way Exchange works?, that all email that was in a different organization mailbox is basically corrupted?.
If so, i would then provide that recommendation (which is not a clean solution) to the GM.

Tks.
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AKIM_CANTONAuthor Commented:
Sambee, could you clearify this point, so that this can be accepted as Solution.  Is there any article where i can read about this.  Thanks.
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Exchange_AdminCommented:
I do not mean to steal Sembee's thunder (he should get the points on this one), but check out this article:
http://support.microsoft.com/kb/327928/en-us

Pay particular attention to Method 4, disadvantages, which is basically what you did.
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SembeeCommented:
The messages are not corrupted. What has happened is that that have lost their link to the database. The new Exchange server is different to the old one, so the new one doesn't know what to do with them. It is one of those things that cannot be avoided when you are going across Org.

Simon.
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