Re: A good spam tool

[Dick Dowdell]

Thanks for the feedback.  However, I do disagree with the idea that 
graylisting would just cause spammers to resend.  Two years ago I left a 
company that was in the process of changing from an Internet marketing 
company into a spammer.  I can assure you that each resend diminishes 
the profitability of spamming and that if everyone graylisted, the 
economics of spamming would change dramatically.  Maybe you've noticed 
the high proportion of spam that comes from Eastern Europe and China.  
I'm sure they're terrified by the prospect of anti-spam laws passed in 
the US and the EEC.  THE ONLY WAY TO STOP SPAM IS TO MAKE IT 
UNPROFITABLE.  Legislation will be no more effective than the War on 
Drugs is.

Regards,
Dick Dowdell
Noel J. Bergman wrote:

Dick Dowdell wrote:
 

Graylisting (see http://projects.puremagic.com/greylisting/ for a full
description) involves logging each incoming piece of mail and rejecting
it with a 451 (Try again later) message.  After a specified period of
time has elapsed for a specific piece of mail, the server will accept it
normally.
   

If greylisting became widespread, spammers would simply resend.  There are
huge amounts of money to be made sending spam, and bypassing greylisting
really isn't that hard, once they know that they have to do it.  Without
being confronted by fines and jail time, spammers aren't going to stop.
In any event, the three key pieces of information for greylisting are:

 The originating IP address
 The MAIL FROM parameter
 The RCPT TO parameter
All of those are available in the SMTPHandler prior to the DATA command.  We
could easily implement greylisting as a fast fail method, but there is not a
pluggable interface for it.
	--- Noel

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