[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 

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 

Kelson Vibber
SpeedGate Communications <www.speed.net>

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