From Dignity Software:
Spam Filter for Outlook is an anti-spam product designed to prevent spam from your inbox. It works as a plug-in in Microsoft Outlook and Outlook Express. More than 1,500 custom rules are included in its content filtering system, so you would never have to build your own rules from the start. Automatically filter all incoming e-mail with more than 1,500 pre-built filters. Spam Filter complete integration with Microsoft Outlook/Outlook Express, no manual configuration or setup required. Create lists of friends and build your own personal rules.