DOCUMENT:Q259065  13-JUN-2001  [exchange]
TITLE   :XFOR: Lotus Notes SMTP Users Receive .unk Files
PRODUCT :Microsoft Exchange
PROD/VER::5.5
OPER/SYS:
KEYWORDS:exc55

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The information in this article applies to:

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

When you send an e-mail message to a Lotus Notes domain by using the Internet
Mail Service (not the Microsoft Exchange Connector for Lotus Notes) the Lotus
Notes recipient may receive a message that contains an attachment named either
Att1.unk or C.dtf.

CAUSE
=====

This issue can occur if you sent the message as Microsoft Rich Text. The Lotus
Notes message transfer agent (MTA) may not correctly read the format of the
message or attachment.

RESOLUTION
==========

To resolve this issue:

 - On the Internet Mail tab in the properties of the Internet Mail Service,
   click Advanced Options, and then change the Rich Text option to User.

-or-

 - On the Internet Mail tab in the properties of the Internet Mail Service,
   click Email Domains, create an entry for the Notes domain (SMTP domain), and
   then select the option to never send Microsoft Rich Text to that domain.

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

More information about which versions of the Lotus Notes SMTP MTA experience
this issue can be found in a Lotus Customer Support Technote, number 145368,
titled Text Attachments Appear as .UNK Files after Passing Through the SMTP MTA.
This Technote is available from the following Lotus Web site:

   http://www.lotus.com


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Additional query words:

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Keywords          : exc55 
Technology        : kbExchangeSearch kbExchange550 kbZNotKeyword2
Version           : :5.5
Issue type        : kbprb

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