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Article: Q235455
Product(s): Microsoft Exchange
Version(s): winnt:5.5
Operating System(s): 
Keyword(s): exc55 EXC55SP3Fix
Last Modified: 30-SEP-1999

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The information in this article applies to:

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

SYMPTOMS
========

When an Exchange Server computer sends a message with blind copy (Bcc)
recipients through an X.400 connector, the primary and copy recipients cannot
see the Bcc recipients if they are all on an Exchange Server computer. However,
if the recipients' mailbox is not on an Exchange Server computer, but on a
third-party X.400 message transfer agent (MTA), they may be able to see the Bcc
recipients.

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: Information Store

+-------------------------+
| File name  | Version    | 
+-------------------------+
| Gapi32.dll | 5.5.2642.0 | 
+-------------------------+
| Mdbmsg.dll | 5.5.2642.0 | 
+-------------------------+
| Netif.dll  | 5.5.2642.0 | 
+-------------------------+
| Store.exe  | 5.5.2642.0 | 
+-------------------------+

Component: Information Store

+--------------------------+
| File name   | Version    | 
+--------------------------+
| Dsamain.exe | 5.5.2600.0 | 
+--------------------------+


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 3.

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

The current implementation of the Bcc functionality in Exchange Server is
modified by sending two different messages: one without Bcc recipients and one
for the Bcc recipients. This guarantees that primary and copy recipients cannot
see the Bcc recipients, no matter what remote third-party MTA is used.

Additional query words: X.400 X400

======================================================================
Keywords          : exc55 EXC55SP3Fix 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : winnt:5.5
Issue type        : kbbug
Solution Type     : kbfix

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

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Q235455: XCON: Modification in X.400 Blind Copy Implementation