XCON: No Rerouting Needed When OU Field is Empty

Last reviewed: February 12, 1998
Article ID: Q166611

The information in this article applies to:

Microsoft Exchange Server, version 4.0
Microsoft Exchange Server, version 5.0

SYMPTOMS

If the following conditions are met, a message coming into a Micrsoft Exchange Server, version 4.0 or 5.0, addressed to:

   C=cc; A=aa; P=pp; O=oo; OU=uu; S=surname

will generate a Non-Delivery Report (NDR) to the originator stating that a loop was detected:

The Microsoft Exchange Server's Site Addressing is set to:
```
      C=cc; A=aa; P=pp; O=oo
```
The Microsoft Exchange Server has a single X400 connector to a X400 provider whose Address Space set to:
```
      C=*
```
The X400 provider forwards all messages with the following address to the Microsoft Exchange Server:
```
      C=cc; A=aa; P=pp
```
A mailbox exists on the Microsoft Exchange Server with an X400 address of:
```
      C=cc; A=aa; P=pp; O=oo; S=surname
```

CAUSE

This happens because the recipient address does not exist in the Microsoft Exchange Directory. The existing mailbox's address does not include OU=uu. Microsoft Exchange Server sends the message back to the X400 provider, which returns it to Microsoft Exchange Server, which then detects the loop.

STATUS

Microsoft has confirmed this to be a problem in Microsoft Exchange Server, version 4.0. A supported fix is now available, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.

Microsoft has confirmed this to be a problem in Microsoft Exchange Server version 5.0. This problem has been corrected in the latest U.S. Service Pack for Microsoft Exchange Server version 5.0. For information on obtaining the service pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

   S E R V P A C K

MORE INFORMATION

After the hotfix has been applied, the Microsoft Exchange Server will immediatly generate an "Unrecognized OR Name" NDR to avoid the rerouting.

Additional query words:
Keywords : kbbug4.00 kbbug5.00 kbfix4.00.sp5 kbfix5.00.sp2 XCON buglist4.00 buglist5.00
Version : 4.0 5.0
Platform : winnt
Issue type : kbbug
Solution Type : kbfix

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Last reviewed: February 12, 1998
© 1998 Microsoft Corporation. All rights reserved. Terms of Use.