The Spam Scanning Service is available to all "@purdue.edu" e-mail addresses. All Mailhub Store Service users (service is set to to "store"), are automatically subscribed to the spam scanning service. Those who "forward" their @purdue.edu e-mail must explicitly subscribe to it. If you wish to subscribe or unsubscribe from the Spam Scanning service, then visit the web page
https://www.itap.purdue.edu/directory/
and click on "Update your Directory Listing".