DOCUMENT:Q245585  12-NOV-2000  [exchange]
TITLE   :XCON: SP3 MTA Replaces DDA Type RFC-822 w/DDA Type SMTP
PRODUCT :Microsoft Exchange
PROD/VER:winnt:5.5 SP3
OPER/SYS:
KEYWORDS:kbExchange550 kbExchange550bug kbExchange550fix exc55sp3 kbExchange550preSP4fix kbExcha

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The information in this article applies to:

 - Microsoft Exchange Server, version 5.5 SP3 
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SYMPTOMS
========

Under certain conditions, the Exchange Server 5.5. Service Pack 3 (SP3) message
transfer agent (MTA) replaces the X.400 Header Field value of the domain-defined
attribute (DDA) Type RFC-822 with the value "SMTP". This replacement can cause
messages to not be delivered.

CAUSE
=====

Exchange Server 5.5 SP3 introduces additional functionality to the MTA,
including modifications to X.400 header handling. When this MTA receives an
incoming message that contains an O/R address with a DDA Type of RFC-822, and is
required to relay the message, it may change the DDA Type to SMTP before
relaying the message. This issue does not occur in earlier versions of Exchange
Server 5.5.

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 Service Pack 3. This problem was first corrected in Exchange Server
5.5 Service Pack 4.

Additional query words: X400 X.400 RFC822

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Keywords          : kbExchange550 kbExchange550bug kbExchange550fix exc55sp3 kbExchange550preSP4fix kbExchange550sp4Fix 
Component         : MTA
Technology        : kbExchangeSearch kbZNotKeyword2 kbExchange550SP3
Version           : winnt:5.5 SP3
Issue type        : kbbug
Solution Type     : kbfix

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