A new demo has been added in the Windows Server 2003 demo portion.The detail of this demo is

Title: How to Configure Incoming Connections in SMTP in Windows Server 2003

Objective: The objective of this demo is to teach you how to configure incoming connections in SMTP in Windows Server 2003. A connection is initiated whenever a message is sent to or received from a remote server. Setting connection limits and imposing connection time-outs can make it more difficult for someone to initiate a malicious attack (such as denial of service) against your virtual server. Limit number of connections to specifies the number of concurrent connections for incoming message delivery. Connection time-out (minutes) specifies the time allowed before an inactive connection is closed.

If you are a subscriber, then click the Demos link in the navigation menu to view the complete list of demos.