Over the past few months, I've been working on a new method of blocking spam
that I've termed "Greylisting". From my testing it appears to be over 97%
effective.
It requires no changes to the infrastructure, is resistant to spammer
adaptation, and is very effective, yet very lightweight.
The paper outlining the method is at
http://projects.puremagic.com/greylisting/ and I have also posted an example
implementation for a Sendmail Milter written in perl.
Please look it over and try to poke holes in it, but I've worked pretty hard
to make it as bulletproof as possible.
Evan
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