DOCUMENT:Q266711  11-JUN-2002  [exchange]
TITLE   :XFOR: CCMC Can't Route Mail with Headers Larger Than 4 KB
PRODUCT :Microsoft Exchange
PROD/VER::5.5
OPER/SYS:
KEYWORDS:exc55 kbExchange550sp4Fix kbExchange2000SP1Fix

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

 - Microsoft Exchange Server, version 5.5 
-------------------------------------------------------------------------------


IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

   Q256986 Description of the Microsoft Windows Registry

SYMPTOMS
========

A message that contains a message header that is larger than 4 kilobytes (KB),
or 4,096 bytes, is returned by the Microsoft Exchange Connector for Lotus
cc:Mail with a non-delivery report (NDR).

CAUSE
=====

The Lotus cc:Mail Import/Export utility version 8.2x and earlier limits message
headers to 4 KB (4,096 bytes). The Connector for cc:Mail uses the Import/Export
utility to process messages and adheres to this limitation.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Exchange Server 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



STATUS
======

Microsoft has confirmed this to be a problem in Microsoft Exchange Server
version 5.5. This problem was first corrected in Exchange Server 5.5 Service
Pack 4.

MORE INFORMATION
================

With the Lotus cc:Mail Import/Export utility version 8.2x and later, the message
header limit is raised to 160 KB (163,840 bytes).

To make the Connector for cc:Mail recognize the new message header limitation,
you must perform the following steps.

WARNING: If you use Registry Editor incorrectly, you may cause serious problems
that may require you to reinstall your operating system. Microsoft cannot
guarantee that you can solve problems that result from using Registry Editor
incorrectly. Use Registry Editor at your own risk.

1. Ensure that the newer versions (8.2x or later) of the Lotus cc:Mail
   Import/Export utility is in place on the Exchange Server computer that is
   running the Connector for cc:Mail.

2. Add the following registry key:

   a. Start Registry Editor (Regedt32.exe).

   b. Locate the following key in the registry:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeCCMC\Parameters

   c. On the Edit menu, click Add Value, and then add the following registry
      value:

   Value Name: Max Address Buffer Size
   Data Type: REG_DWORD
   Radix: Hexadecimal
   Value: 28000

   d. Quit Registry Editor.

The third-party products discussed in this article are manufactured by vendors
independent of Microsoft; we make no warranty, implied or otherwise, regarding
these products' performance or reliability.

Additional query words: CCMC

======================================================================
Keywords          : exc55 kbExchange550sp4Fix kbExchange2000SP1Fix 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : :5.5
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 2002.