[Mimedefang] Image blocking idea
Kelson
kelson at speed.net
Thu Apr 20 20:52:58 EDT 2006
David F. Skoll wrote:
> I'm not saying greet_pause or greylisting are useless... you might as well
> keep using them to get the low-hanging fruit. But I predict they will
> become less useful in future.
Greylisting and greet_pause share one characteristic: They apply
selection pressure to encourage RFC-compliant behavior in mail sending
software.
Both rely on the fact that authors of spam software often cut corners,
and both run into problems where authors of general-purpose mail
software cut the same corners. The long-term effect will be an
ecosystem where nearly all SMTP senders wait for the full SMTP handshake
and retry when provided with a temporary rejection. The short-term
effect is that we can catch a bunch of spam with these rules until they
adapt.
--
Kelson Vibber
SpeedGate Communications <www.speed.net>
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