Re: [Asrg] New proposal for spam blocking: Greylisting

[Scott Nelson <scott@helsbreth.org>]

At 10:29 AM 6/20/03 -0500, Evan Harris wrote:
>
>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.
>

My summary of the greylisting;
 Tempfail all new (IP+sender+recipient) triplets.


I only made one pass through the paper, but it looks pretty good to me.
97% feels high for this technique, but it's looks clean enough and
safe enough that I'll run some tests on my own and see if I get similar
numbers.

Scott Nelson <scott@spamwolf.com>

 


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