SpamArrow is a spam filtering plug-in for Outlook Express. SpamArrow uses scoring content filters taken from SpamAssassin(tm) 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 95% 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 best (and usually) used on Unix. Thanks to SpamArrow, you can have SpamAssassin-class spam filtering in the most popular email client Outlook Express under Windows,without any effort.