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Jim, the easiest way I can explain it is to compare it to most filtering systems out there (inlcuding my mail system).
You write rules and declare things as "spam". Over time more and more rules are written to filter spam. Eudora uses (if I remember correctly) a sort of voting system where the more people that make something spam, the more likely it is to be spam. Yahoo mail does the same.
But the nature of this is "good to start, spam if you make it spam". Spamarrest works the other way "spam until you prove you are human". Once they prove they are human, you never have to worry about them again. It isn't a blacklist - it is a whitelist that people can become part of without any action on your part. I scan the spam messages looking for programs and stuff right now, but over time that will become more and more rare as I will have the programs I use in there.
I might whitelist 500 or 1000 senders over time, but that is a whole lot easier than trying to blacklist the millions of spam mail accounts and misspelled version of v\@gr/\ and c|@l\s out there.
Alex
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