SpamCop FAQ : SpamCop Blocking List information :
How can I use the blocklist without mail server configuration?
Many spam filtering systems automatically use the SpamCop blocklist as part of a larger scheme. SpamCop does not review or guarantee these third party products.
One very effective and well-known filter is
Spam Assassin; an open-source perl scoring system. Spam Assassin can be installed on unix-based systems in either system-wide or in "user land". It is highly configurable.