Spam Guard is an Outlook add-in that filters e-mail that arrives in your inbox. If the sender of any message cannot be identified then the message is moved into a spam quarantine folder. Messages deposited in the spam quarantine folder can be inspected and either deleted or approved at your leisure. Senders are identified from previous messages that you have received, from messages you have sent and also from your address book. The senders of any messages approved in the spam quarantine folder are also added to the list. You can also select domains to be approved too. The add-in works with Outlook 2000 and Outlook XP but does not work with Outlook Express.