How to Enable an Exchange Server to Accept Message Extended Properties that Are Sent Anonymously
When messages are sent anonymously across forests, the extended message properties on a message are not transmitted. However, many small organizations that implement a cross-forest scenario must transmit message properties because that information could otherwise be lost.
For example, the spam confidence level (SCL) property, an extended Exchange Server property, contains a spam rating that is generated by third-party solutions. This property is not transmitted when mail is sent anonymously. If an anti-spam solution is deployed in one forest, and a message is received in this forest is destined to a recipient in another forest, the anti-spam solution will stamp the SCL property on the message. However, when the message is delivered the extended property will not be persisted.
To configure Exchange Server to accept extended message properties, you must enable a registry key on the receiving bridgehead server that resides on the bridgehead. This will allow the Exchange server to accept extended properties anonymously.
Before You Begin
Before you perform the procedure in this topic, read Deployment Scenarios for Internet Connectivity.
The following permissions are required to perform this procedure:
- Member of the local administrators group
Procedure
To enable an Exchange server to accept message extended properties that are sent anonymously
Start Registry Editor: Click Start, click Run, and then type regedit.
In the console tree, navigate to the following registry key:
HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\SMTPSVC\ XEXCH50
Right-click XEXCH50,point to New, and then click DWORD Value.
In the details pane, type Exch50AuthCheckEnabled for the value name. By default, the value data is 0, which indicates that the XEXCH50 properties are transmitted when mail is sent anonymously.