Microsoft KB Archive/331061

= The SMTP Message Screener may not filter some messages correctly in ISA Server 2000 =

Article ID: 331061

Article Last Modified on 6/14/2007

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APPLIES TO


 * Microsoft Internet Security and Acceleration Server 2000 Standard Edition
 * Microsoft Internet Security and Acceleration Server 2000 Service Pack 1

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This article was previously published under Q331061





SYMPTOMS
When you use the Internet Security and Acceleration (ISA) Server 2000 Simple Mail Transfer Protocol (SMTP) Message Screener to filter e-mail messages, the SMTP Message Screener may not filter some messages correctly.



CAUSE
This problem occurs if the ISA Server SMTP Message Screener filters multipart messages.

In Microsoft Outlook, e-mail messages and attachments are split into multipart messages if the total size of the message is too large to be sent as a single message. When an e-mail message and an attachment are split into multipart messages, the file names and the file extensions are changed from the original file names and file extensions. Therefore, some of the rules that you created may not function correctly. For example, rules that you created to delete attachments that contain .exe file extensions do not function correctly because the multipart messages are assigned new file extensions. The ISA Server SMTP Message Screener does not detect the original extensions. Therefore, the ISA Server SMTP Message Screener does not filter the messages.



Service pack information
To resolve this problem, obtain the latest service pack for ISA Server 2000. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

313139 How to obtain the latest Internet Security and Acceleration Server 2000 service pack

Hotfix information
A supported hotfix is now available from Microsoft. However, this hotfix is intended to correct only the problem that is described in this article. Apply this hotfix only to systems that are experiencing this specific problem. This hotfix might receive additional testing. Therefore, if you are not severely affected by this problem, we recommend that you wait for the next service pack that contains this hotfix.

To resolve this problem, submit a request to Microsoft Online Customer Services to obtain the hotfix. To submit an online request to obtain the hotfix, visit the following Microsoft Web site:

http://go.microsoft.com/?linkid=6294451

Note If additional issues occur or any troubleshooting is required, you might have to create a separate service request. The usual support costs will apply to additional support questions and issues that do not qualify for this specific hotfix. To create a separate service request, visit the following Microsoft Web site:

http://support.microsoft.com/contactus/?ws=support

The English version of this hotfix has the file attributes (or later) that are listed in the following table. The dates and times for these files are listed in coordinated universal time (UTC). When you view the file information, it is converted to local time. To find the difference between UTC and local time, use the Time Zone tab in the Date and Time tool in Control Panel.   Date         Time      Version       Size    File name     Platform ---  22-Oct-2002  14:25:24  3.0.1200.180  60,176  Fltrsnk1.dll  x86 22-Oct-2002 14:25:28  3.0.1200.180  93,968  Fmtpfltr.dll  x86



STATUS
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the &quot;Applies to&quot; section. This problem was first corrected in ISA Server 2000 Service Pack 1.

Keywords: kbhotfixserver kbqfe kbqfe kbbug kbfix KB331061

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