X-headers are assigned the same value instead of expected distinct values when you send an Internet e-mail message from an Exchange Server 5.5 computer

You are using a MAPI program that sets properties in the PS_INTERNET_HEADERS namespace. You expect the properties to be converted to custom X-headers when you send an outgoing Internet e-mail message through your Microsoft Exchange Server 5.5 computer. However, the conversion does not occur as expected. All the X-headers are assigned the same value, instead of being assigned distinct values.

When two or more custom Simple Mail Transfer Protocol (SMTP) headers are set on an outgoing message by using Extended MAPI, the value of the first custom header overwrites the values of the subsequent custom X-headers.

Hotfix information

A supported hotfix is now available from Microsoft, but it is only intended to correct the problem that this article describes. Apply it only to systems that are experiencing this specific problem.

To resolve this problem, contact Microsoft Product Support Services to obtain the hotfix. For a complete list of Microsoft Product Support Services telephone numbers and information about support costs, visit the following Microsoft Web site:Note In special cases, charges that are ordinarily incurred for support calls may be canceled if a Microsoft Support Professional determines that a specific update will resolve your problem. The usual support costs will apply to additional support questions and issues that do not qualify for the specific update in question.

Prerequisites

To install this hotfix, you must be running Exchange Server 5.5 Service Pack 4.

Restart requirement

You do not have to restart your computer after you apply this hotfix. However, the Microsoft Exchange Information Store and all dependent services are automatically stopped and restarted during the installation process.

Hotfix replacement information

This hotfix does not replace any other hotfixes.

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.

For additional information about Microsoft software updates, click the following article number to view the article in the Microsoft Knowledge Base: