greylisting

[Kristian Hermansen]

How does Gmail do it?  Do they utilize the fact that millions of their
users (agents) help in the learning process of what is 'spam' by
clicking that 'Report Spam' button?  Or do they have some other
fiendish algorithm at work?  Is there some highly respected research
paper on spam that most people refer to?  I have to admit, I switched
to gmail mainly because I was running my own mail server, and keeping
out spam was too much of a pain.  I would get about 50x more spam than
real messages!  I was on many public mailing lists, and I assume that
this is how my email propagated to spammers.  Now, with Gmail doing
the work for me, I post my email publicly and even put it into spam
databases just for fun and to see if I can get a SPAM message through
Gmail.  However, Gmail catches them every time :-)
-- 
Kristian Hermansen

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