Open Source Filtering Solutions and the Spam Problem

“Let us face it, modern e-mail communication relying on SMTP is
fundamentally broken–there is no sender authentication. There are
lot of countermeasures in form of filtering and add-on
authentication, but neither of them are proved to be 100%
successful (that is 100% hit ratio with 0% of false positives).
Spammers always find new ways of confusing filters with random
noise, bad grammar, hidden HTML code, padding, bitmap-rendered
messages etc. Our world is becoming an overloaded and unusable
mailbox of spam. This article will nevertheless try to cover some
of the spam problems and possible solutions, but bare in mind that
all of these are just no more than a temporary fix…”

Complete
Story