ietf-822
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Re: Statistics of "intelligence" in e-mail spams

2001-01-22 14:50:25
One approach that I've thought casually revolves around a feature in
Sendmail that would open an SMTP connection back to the sending host
(assuming the sender had smtp services) and test it for relaying mail back
to you.  You could then accept or reject mail from that host based on the
finding. 

won't work.  lots of sites have separate outgoing and incoming MTAs, and
nothing says that a 'sending host' even has to listen for inbound SMTP
connections. 

admittedly, lots of other ideas for filtering spam - some that people
actually implement, like filtering out source addresses that correspond
to dialup lines - are no better.

Keith