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Error MSExchangeTransport event ID 3020

Posted on 2007-11-20
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Last Modified: 2009-07-24
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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Question by:icic-dcic
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4 Comments
 
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by:debuggerau
ID: 20325580
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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by:icic-dcic
ID: 20326083
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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debuggerau earned 500 total points
ID: 20332384
I'd doubt these errors are related, however the POP3SVC might be from Virus protection or connections dropping, shouldn't happed often though.

OK, assuming you have a AD integrated exchange server, the email addresses are in
Active Directory Users and Computers -> Users -> Select User
Select the tab marked 'E-mail Addresses' and they will be listed below.

To check the contacts, just select a contact rather than a user above...

Now, the server is complaining that an email is used twice in a forest, but in a different container.
Without seeing your AD setup, I cant know how complex it will be to find, you may need some tools or scripts to report on the email addresses used.

Checkout scriptomatic at the scripting center, they have some CDO scripts that will report email addresses.

Hope that helped.
Regards
Greg

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