Microsoft KB Archive/259065

= XFOR: Lotus Notes SMTP Users Receive .unk Files =

Article ID: 259065

Article Last Modified on 10/28/2006

-

APPLIES TO


 * Microsoft Exchange Server 5.5 Standard Edition

-



This article was previously published under Q259065



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-306.ibm.com/software/lotus/

Microsoft provides third-party contact information to help you find technical support. This contact information may change without notice. Microsoft does not guarantee the accuracy of this third-party contact information.

The third-party products that are discussed in this article are manufactured by companies that are independent of Microsoft. Microsoft makes no warranty, implied or otherwise, regarding the performance or reliability of these products.

Keywords: kbprb KB259065

-

[mailto:TECHNET@MICROSOFT.COM Send feedback to Microsoft]

© Microsoft Corporation. All rights reserved.