A sender's e-mail address appears to a recipient as two distinct addresses if the sender's display name contains a comma and extended characters in Exchange 2000 or in Exchange 2003

When a user sends an e-mail message, the e-mail message that is received by the recipient contains incorrect e-mail address information in the From box. The sender's e-mail address appears as two distinct addresses. This problem occurs if the following conditions are true:

• The organization that the user belongs to is running Microsoft Exchange Server 2003 or Microsoft Exchange 2000 Server.
• The sender's display name contains a comma and extended characters.

When the recipient of the message replies, that recipient receives a non-delivery report (NDR) because the From box contains incorrect e-mail address information.

To resolve this problem, apply the service pack or the hotfix that is appropriate for the version of Exchange Server that you are running and add the registry key at the end of the article.

Exchange Server 2007

This fix is included in the release version of Exchange Server 2007. If you are using Exchange 2007, you do not have to apply an update or install a hotfix. However, you must activate the fix by using the registry key that is mentioned in the "Registry information" section and by restarting related services, such as the Microsoft Exchange Information Store and the IIS Admin Service. (The other services that are mentioned in the "Restart requirement" section do not have to be restarted in Exchange 2007.)

Exchange Server 2003

Service pack information

To resolve this problem, obtain the latest service pack for Exchange 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

Because of file dependencies, this hotfix requires that you install Microsoft Exchange Server 2003 Service Pack 1. For more information, click the following article number to view the article in the Microsoft Knowledge Base:

Restart requirement

You do not have to restart your computer after you apply this hotfix. However, you must restart the following services after you apply this hotfix:

• Microsoft Exchange Information Store
• World Wide Web Publishing Service
• Simple Mail Transfer Protocol (SMTP)
• Microsoft Exchange Routing Engine
• HTTP SSL
• IIS Admin Service

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 item in Control Panel.

Exchange 2000 Server

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

Because of file dependencies, this hotfix requires that you install Microsoft Exchange 2000 Server Service Pack 3 and the Exchange 2000 Server post-Service Pack 3 update. For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:

Restart requirement

You do not have to restart your computer after you apply this hotfix. However, you must restart the Microsoft Exchange Information Store service after you apply this hotfix.

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 item in Control Panel.

Registry information

Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall your operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

After you apply the service pack or the hotfix for Exchange Server 2003 or Exchange 2000 Server, you must add the RFC2047Compliant registry entry to implement the update. To do this, follow these steps:

1. Click Start, click Run, type regedit in the Open box, and then press ENTER.
2. Locate and then right-click the following registry subkey:
   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\MSExchangeIS\ParametersSystem\InternetContent\
3. Point to New, and then click DWORD value.
4. Type RFC2047Compliant to name the new value, and then press ENTER.
5. Right-click RFC2047Compliant, and then click Modify.
6. In the Value data box, type 0, and then click OK.
7. Exit Registry Editor.

Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section. This problem was first corrected in Microsoft Exchange Server 2003 Service Pack 2.

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