A hotfix is available to enable the Computational Proof functionality to obtain a list of RFC 2821 recipients from a computer that is running Windows Server 2003

This article describes a hotfix that you can apply to enable the Computational Proof functionality of the Intelligent Message Filter (IMF) to work correctly. This functionality lets you obtain a list of RFC 2821 recipients from a computer that is running Microsoft Windows Server 2003.

Microsoft Exchange Server 2003 Service Pack 2 (SP2) includes IMF version 2. IMF version 2 uses SmartScreen technology. IMF version 2 also provides a framework to enable the Computational Proof functionality. Computational Proof reduces the chance that legitimate e-mail messages are interpreted as unsolicited commercial e-mail (UCE).

Note UCE is also known as spam.

The Computational Proof functionality requires access to a list of RFC 2821 recipients to work correctly. However, Microsoft Exchange Server 2003 does not expose the ability to obtain a list of RFC 2821 recipients.

Service pack information

To resolve this problem, obtain the latest service pack for Windows Server 2003. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Hotfix information

A supported hotfix is 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 software update that contains this hotfix.

If the hotfix is available for download, there is a "Hotfix download available" section at the top of this Knowledge Base article. If this section does not appear, contact Microsoft Customer Service and Support to obtain the hotfix.

Note If additional issues occur or if 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. For a complete list of Microsoft Customer Service and Support telephone numbers or to create a separate service request, visit the following Microsoft Web site: Note The "Hotfix download available" form displays the languages for which the hotfix is available. If you do not see your language, it is because a hotfix is not available for that language.

Prerequisites

You must have Microsoft Windows Server 2003 Service Pack 1 (SP1) installed to apply this hotfix. For more information, click the following article number to view the article in the Microsoft Knowledge Base: Additionally, to enable the functionality that this hotfix provides, you must apply the Exchange Server 2003 hotfix that is described in the following article in the Microsoft Knowledge Base:

Restart requirement

You do not have to restart the computer after you apply this hotfix. However, the Microsoft Internet Information Services (IIS) Admin Service and all its dependent services are automatically stopped and then restarted.

Hotfix replacement information

This hotfix does not replace any other hotfix.

File Information

The English version of this hotfix has the file attributes (or later file attributes) 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 item in Control Panel.

Windows Server 2003, 32-bit x86 versions

Windows Server 2003, 64-bit x64 versions

Windows Server 2003, 64-bit IA-64 versions

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.

For more information, click the following article number to view the article in the Microsoft Knowledge Base: