This patent-pending product authenticates the sender of each incoming e-mail message. During installation, your e-mail address book is imported by Bongosoft AntiSpam to form a foundation of 'allowed' senders. If an e-mail arrives from an unknown sender, Bongosoft AntiSpam automatically sends a 'challenge' message to that sender asking them to reply with your AntiSpam passcode. The AntiSpam passcode is sent along with the 'challenge' message in a graphical file. When the reply message is received and the passcode is found to be correct, that sender's original e-mail and all subsequent e-mail from that sender are passed to your inbox.

The program supports Outlook, Outlook Express, Eudora, Netscape Messenger, OpraMail, or any application accessing POP3 e-mail accounts.

Version 4.35 features added support for OpraMail and other minor updates.