Spam Sleuth, more than a simple filter, monitors your e-mail box behind the scenes and analyzes e-mail messages for spam and virus characteristics. It keeps a report of what it finds so you know why an e-mail has been deemed spam. If Spam Sleuth determines an e-mail is spam, it yanks it out of the e-mail server, compresses it so that it takes as little space as possible on your computer, and keeps a report with the suspect e-mail. When your e-mail program gets your e-mail, the spam is removed and you can read your e-mail the same way you always have, but without sorting through the junk.

It features e-mail stamps, which requires senders to pay a fee via PayPal before a message will arrive in your inbox; and Turing Test, which requires senders to enter a validation code before an e-mail will arrive in your inbox.