SpamArrow is a spam filter plug-in based on SpamAssassin for Outlook and Outlook Express. SpamArrow uses scoring content filters taken from SpamAssassin to identify spam. Additionally, you can train SpamArrow to use Bayesian statistics for even better accuracy. Mail determined to be spam is moved to a special "SpamArrow" folder automatically. Without any kind of configuration it can block more than 98% spams. The greatest thing is that SpamArrow doesn't make any change to your Outlook Express account settings and to your original messages or add any mail rules. SpamAssassin is a powerful and smart set of filters that identify spam based on many characteristics. SpamAssassin is usually used on server side.
Version 1.20 adds an Option window for SpamAssasin configuration.