DOCUMENT:Q192939  24-APR-1999  [exchange]
TITLE   :XFOR: Event 4123; Message Not Delivered
PRODUCT :Microsoft Exchange
PROD/VER:WinNT:5.5
OPER/SYS:
KEYWORDS:exc55sp2fix

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The information in this article applies to:

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

A message sent from Exchange through the Internet Mail Service contains the
property PR_AUTO_FORWARDED but the value is set to False or 0. The Internet Mail
Service has the "Disable Auto Replies to the Internet" option selected. This
message generates the following event 4123 and the message is dropped.

   Event: 4123
   Source: MSExchangeIMC
   Description: A message passing through the Internet Mail Service has
   been intentionally dropped. This is most likely an admin notification
   (message describing mail failure), an out of office notification (OOF),
   or an automatic reply from a user's mailbox. Dropping of OOF messages
   and automatic replies is configurable in the admin pages. The gateway
   must always drop notifications to the administrator, since they often
   cause mail loops.

CAUSE
=====

A third-party gateway may add the PR_AUTO_FORWARDED property per documentation
in the Microsoft Developer Network (MSDN). The message is delivered into the
Exchange system. If the message is replied to by a user on Exchange and sent to
an address that will be delivered through the Internet Mail Service, the system
acts on the message based on the property's existence and not its value.

The WorldTalk gateway may add the PR_AUTO_FORWARDED property to messages.

RESOLUTION
==========

To resolve this problem, obtain the latest service pack for Exchange Server
version 5.5. For more 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: Internet Mail Service

   File Name      Version
   -------------------------
   Msexcimc.exe   5.5.2387.0

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 2.

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Keywords          : exc55sp2fix 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : WinNT:5.5
Issue type        : kbbug
Solution Type     : kbfix

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