Event ID 4786 is logged when you send an e-mail message that has a Content-Transfer-Encoding value that is not valid

When you send an e-mail message that has the Content-Transfer-Encoding value set to a value that is not valid, such as "plain," the following Error event is logged in the Application log:

Event ID: 4786
Source: COM+
Type: Error
Description:
The system has called a custom component and that component has failed and generated an exception. This indicates a problem with the custom component. Notify the developer of this component that a failure has occurred and provide them with the information below.

This problem occurs because a Content-Transfer-Encoding value that is not valid and that is in a message causes an exception to be thrown in the CDOEX.dll file. Additionally, the exception is not handled. Therefore, the COM+ fail-fast process stops the event sink application and then logs event ID 4786. The event sink will not run until you restart the sink in the COM+ Component Manager snap-in.

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.

Restart requirement

You have to restart the computer after you install this 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 tool in Control Panel.

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

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