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Error MSExchangeTransport event ID 3020

Now I'm facing this error in Exchange. Any help would be very appriciate
Source: MSExchangeTransport
Category: NDR
Event ID 3020
 
 
Cause: A forward loop was detected by the categorizer. This is a common hosting configuration problem caused when someone uses the provisioning tool to create a contact in one organization unit and creates a user in a different organization user that share the same e-mail address.    
Solution: Verify that you do not have a user in organizational unit and a contact in a different organizational unit that have the same e-mail address. 
 
For more information, see Help and Support Center at

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debuggerau
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Do you know where to look in Active Directory to check email addresses?
Did you get another error in the event log to point out the offending entry?

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icic-dcic

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I know where to look in Active Directory to check email address. that is Properties account and see it in General tab. Is it right? And I just get that error. and sometime i get event error 1023 POP3SVC

Source: POP3SVC
Category: Content Engine
Event ID: 1023
Error 0x7d6 occurred while rendering message 0001-000000086a54 for download for user minhduc.le@icic.vn. 
 
For more information, click http://www.microsoft.com/contentredirect.asp. 

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