Email Filtering Service Web Products

Spam Bully (Rate) (Report)
Their site states “Spam Bully utilizes the latest technology which learns from spammers messages and continually adjusts its spam filter to protect your mailbox. Using proactive rather than reactive methods for eliminating spams, it can block over 99% of spam in most cases.” There is a free two week trial period.
Price: 29.95 US Dollars
Spam Sleuth (Rate) (Report)
Scans for viruses, uses updated blacklists to filter, challenge/response, whitelists, bayeasian filtering amd other techniques. Includes a money back guarantee.
Price: 29.95 US Dollars
Spam Interceptor (Rate) (Report)
Provides a choice of using heuristic filters, authentication, white lists, gray lists, black lists, or any combination of filtering techniques. Mail is accessed using a web browser. There is a free version with the full account costing $14.97 per year.
Price: 14.97 US Dollars
Alien Camel (Rate) (Report)
Provides email accounts that are spam filtered. It uses whitelists, blacklists, bayesian filtering, and provides virus scanning. It supports IMAP, POP3, and web browser webmail access.
Price: 15.95 US Dollars every 6 months
Spam Arrest (Rate) (Report)
A challenge/response spam filtering service that works with your current email address. Allows pre-configuration of approved senders and gives you access to unapproved email.
Price: 0.00
G-Lock SpamCombat (Rate) (Report)
Uses a combination of blacklists, whitelists, and Bayesian filtering to produce an effective anti-spam solution. Allows removal of spam emails from the mail server without bringing them down into your inbox.
Price: 35.00 US Dollars