Spamfighter works with Microsoft Outlook and Outlook Express. Spam is
identified with a list from other users. Every time you mark a message as spam
everybody else with Spamfighter has it automatically marked and deleted.
You can create a whitelist with Spamfighter so that emails from people in
your address book will always get through.
The Spamfighter website has a running total of the number of emails processed
and the new users who have joined the group.
Spamfighter is free for home users. Note that there is a Professional version
available which offers even more protection, such as an advanced filter, the
ability to remove the Spamfilter footer added to your outgoing emails,
commercial support and much more.