DOCUMENT:Q232656  02-OCT-1999  [exchange]
TITLE   :XCON: MTA X.400 1988 to 1984 Downgrade Failure Causes NDR
PRODUCT :Microsoft Exchange
PROD/VER:winnt:5.5
OPER/SYS:
KEYWORDS:exc55 EXC55SP3Fix

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

 - Microsoft Exchange Server, version 5.5 Service Packs 1, 2 
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SYMPTOMS
========

When a message is routed from a 1988 X.400 Connector over a 1984 X.400
Connector, the message transfer agent (MTA) correctly downgrades Common Names in
the message content (P2), but doesn't downgrade Common Names in the message
envelope (P1). If the receiving MTA is an Exchange Server MTA, it tolerates this
error, but if the MTA is a foreign MTA, it may generate a non-delivery report
(NDR) for the original message, with a diagnostic of Recipient Unknown.

If the recipient O/R Address on a message contains a Common Name, and the message
is routed over a 1984 X.400 Connector (assuming the Allow MS Exchange Contents
check box on the X.400 Connector Advanced property page is cleared), the Common
Name should be downgraded. The downgrade consists of following the 1988 to 1984
downgrade rules, and converting the Common Name to a Domain Defined Attribute
(DDA), of Type=Common, Value=Common Name.

CAUSE
=====

This problem is caused by the 1988 to 1984 downgrade rules being incorrectly
applied to the message envelope.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Exchange Server
version 5.5. For additional information, please see the following article in the
Microsoft Knowledge Base:

   Q191014 XGEN: How to Obtain the Latest Exchange Server 5.5 Service Pack

The English version of this fix should have the following file attributes or
later:

Component: MTA

+---------------------------+
| File name    | Version    | 
+---------------------------+
| Emsmta.exe   | 5.5.2621.0 | 
+---------------------------+
| Ems_rid.dll  | 5.5.2621.0 | 
+---------------------------+
| Mtamsg.dll   | 5.5.2621.0 | 
+---------------------------+
| Infoblog.cfg | N/A        | 
+---------------------------+
| Infodlog.cfg | N/A        | 
+---------------------------+
| Infollog.cfg | N/A        | 
+---------------------------+
| Infoplog.cfg | N/A        | 
+---------------------------+
| Infotlog.cfg | N/A        | 
+---------------------------+
| Info4log.cfg | N/A        | 
+---------------------------+
| Dcprods.cat  | N/A        | 
+---------------------------+
| X400om.dll   | 5.5.2621.0 | 
+---------------------------+
| X400omv1.dll | 5.5.2621.0 | 
+---------------------------+
| Mtacheck.exe | 5.5.2621.0 | 
+---------------------------+
| Dbserver.sch | N/A        | 
+---------------------------+
| P2.xv2       | N/A        | 
+---------------------------+



STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 5.5 SP1 and SP2. This problem was first corrected in Exchange Server 5.5
Service Pack 3.

Additional query words:

======================================================================
Keywords          : exc55 EXC55SP3Fix 
Technology        : kbZNotKeyword8 kbExchangeSearch kbZNotKeyword2 kbExchange550SP1
Version           : winnt:5.5
Issue type        : kbbug
Solution Type     : kbfix

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

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