BopSpam

Unlike most anti-spam tools, BopSpam lets you control the flow of your mail via the web, with no need to install any software. Spam is intercepted before it reaches your computer, eliminating the need to delete messages manually, with a summary email sent to you at the end of each day in case something you wanted to see was stopped. This is unlikely though as BopSpam performs its job brilliantly, automatically sorting the legitimate wheat from the junk chaff.

Impressively, the service combines all three methods of spam filtering – Bayesian, heuristic and black-and-white – as well as options for blocking adult websites, viruses, worms and specific types of email attachment. While you need to configure your email program to collect mail through BopSpam, full instructions are provided at its website and you can check up to 10 separate accounts.