DOCUMENT:Q221699  01-OCT-1999  [exchange]
TITLE   :XFOR: MTA Includes Else Doorways into Previous Route Siblings
PRODUCT :Microsoft Exchange
PROD/VER:winnt:5.5 SP2
OPER/SYS:
KEYWORDS:exc55sp2 EXC55SP3Fix

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The information in this article applies to:

 - Microsoft Exchange Server, version 5.5 SP2 
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SYMPTOMS
========

The Microsoft Exchange Server Message Transfer Agent (MTA) can incorrectly route
a message in an enterprise in which a large number of address spaces are used
and several "else" branches exist.

CAUSE
=====

The MTA will attempt to provide "else" doorway refinements in order to ensure
that all possible routes are included in the GWART. If enough refinements exist,
some "else" doorways may be unnecessary and cause a generic match to be found
before all exact matches have been checked.

For example, if you have several available routes with multiple C=, A=, P=, and
O= values in the GWART for routes to many connectors. One route might be set to
indicate a generic route. That route should be added at the end under an "else"
statement indicating that if all previous possible routes do not match, use this
route by default. In this case (under certain circumstances), the route used
under the "else" could also appear under previous values in the GWART.

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: Message Transfer Agent (MTA)

+---------------------------+
| File name    | Version    | 
+---------------------------+
| Dbserver.sch | N/A        | 
+---------------------------+
| Dcprods.cat  | N/A        | 
+---------------------------+
| Ems_rid.dll  | 5.5.2562.0 | 
+---------------------------+
| Emsmta.exe   | 5.5.2562.0 | 
+---------------------------+
| Info4log.cfg | N/A        | 
+---------------------------+
| Infoblog.cfg | N/A        | 
+---------------------------+
| Infodlog.cfg | N/A        | 
+---------------------------+
| Infollog.cfg | N/A        | 
+---------------------------+
| Infotlog.cfg | N/A        | 
+---------------------------+
| Mtacheck.exe | 5.5.2562.0 | 
+---------------------------+
| Mtamsg.dll   | 5.5.2562.0 | 
+---------------------------+
| P2.xv2       | N/A        | 
+---------------------------+
| X400om.dll   | 5.5.2562.0 | 
+---------------------------+
| X400omv1.dll | 5.5.2562.0 | 
+---------------------------+

The fix can be applied to Exchange Server computers with Service Pack 2
installed.


STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 5.5 Service Pack 2. This problem was first corrected in Exchange Server
5.5 Service Pack 3.

Additional query words:

======================================================================
Keywords          : exc55sp2 EXC55SP3Fix 
Technology        : kbExchangeSearch kbZNotKeyword2 kbExchange550SP2
Version           : winnt:5.5 SP2
Issue type        : kbbug
Solution Type     : kbfix

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

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Copyright Microsoft Corporation 1999.