How to Enable an SMTP Virtual Server to Accept Extended Message Properties Sent Anonymously

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If you have other SMTP virtual servers on your Exchange server, consider setting this registry key on the SMTP virtual server only. If your Exchange server functions solely as the bridgehead server for cross-forest communication, you may want to enable the bridgehead server to accept extended message properties sent anonymously at the server level.

For detailed steps about how to enable an Exchange Server to accept extended message properties sent anonymously, see How to Enable an Exchange Server to Accept Extended Message Properties Sent Anonymously.

Note

If you enable this registry key on an Exchange server, the setting applies to all SMTP virtual servers on the Exchange server. If you want to configure a single SMTP virtual server with this setting, enable the registry key on the SMTP virtual server.

Before You Begin

Before you perform the procedure in this topic, be aware that the procedure contains information about editing the registry.

Warning

Incorrectly editing the registry can cause serious problems that may require you to reinstall your operating system. Problems resulting from editing the registry incorrectly may not be able to be resolved. Before editing the registry, back up any valuable data.

Procedure

To enable an SMTP virtual server to accept message extended properties sent anonymously

  1. Start Registry Editor.

  2. Navigate to HKLM\SYSTEM\CurrentControlSet\Services\SMTPSVC\XEXCH50.

  3. Right-click XEXCH50, select New, and then click Key.

  4. Type the number of the SMTP virtual server instance as the key value. For example, the default SMTP virtual server instance is 1, while the second SMTP virtual server created on a server is 2.

  5. Right-click the key you just created, point to New, and click DWORD Value.

  6. In the details pane, type Exch50AuthCheckEnabled for the value name. By default, the value data is 0, which indicates that the extended message properties are transmitted when mail is sent anonymously.

For More Information

For information about how to edit the registry, see Microsoft Knowledge Base article 256986, "Description of the Microsoft Windows Registry" (https://go.microsoft.com/fwlink/?linkid=3052&kbid=256986).