greylisting

[Kristian Hermansen]

On 3/11/07, James Kramer <kramerjm at gmail.com> wrote:
> That is a good question.  They could be using Exim with all the ACL
> stuff maxed out on their server farms but their email responds too
> quickly and doesn't seem to blacklist questionable sites.

Snarfed from:
http://labs.google.com/papers.html

Sender Reputation in a Large Webmail Service, Bradley Taylor, Third
Conference on Email and Anti-Spam (CEAS 2006), 2006

Short read too:
http://www.ceas.cc/2006/19.pdf
-- 
Kristian Hermansen

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