MessageAuthority is a SPAM Filter that integrates into Outlook and Outlook Express to Prevent junk mail from reaching your inbox. MessageAuthority is accurate at detecting spam immediately without configuration. It starts with a base analysis of over 35,000 spam messages and adds a toolbar to Outlook and Outlook Express. Its self-tuning engine learns from the e-mail that you receive and send and fine-tunes itself automatically. MessageAuthority also includes optional Spam detection techniques such as Friends Lists, Block Lists, simulated bounce messages, and Challenge/Response. Challenge/Response sends an e-mail back to the sender with a code that needs to responded with to be accepted as a legitimate sender. This separates mass mailers from legitimate senders because mass mail programs cannot not respond with the code because it is only readable by the human eye. MessageAuthority gives you total control over how your e-mail is handled.