DOCUMENT:Q161711  12-APR-1999  [exchange]
TITLE   :XCON: Messages NDR Rather Than Being Queued for Later Delivery
PRODUCT :Microsoft Exchange
PROD/VER:winnt:4.0
OPER/SYS:
KEYWORDS:kberrmsg kbprogramming kbusage

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Exchange Server, version 4.0 Service Packs 1, 2 
-------------------------------------------------------------------------------

SYMPTOMS
========

When a message is sent to a recipient in another site by means of a Site
Connector, if the destination server is down, the message may be returned by the
System Administrator as undeliverable, with the following error message:

   The recipient could not be processed due to congestion in the message
   transfer service.

CAUSE
=====

The above symptoms will occur if there is an alternate Site Connector for the
message to travel over, but the path from the alternate site to the destination
server is also unavailable. The message will be re-routed to the alternate site,
and then returned to the sender undeliverable as above.

STATUS
======

Microsoft has confirmed this to be a problem in Exchange Server 4.0. This
problem was corrected in the latest Microsoft Exchange 4.0 U.S. Service Pack.
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


Additional query words:

======================================================================
Keywords          : kberrmsg kbprogramming kbusage 
Technology        : kbPTProdChange kbExchangeSearch kbZNotKeyword2
Version           : winnt:4.0
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.  MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.  SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 1999.