Spam Challenge-Response system

Jessie Morris jessie at confettiantiques.com
Fri Apr 10 13:08:01 MDT 2009


On Friday 10 April 2009 12:53:45 pm Andy Bradford wrote:
> Thus said Michael Torrie on Thu, 09 Apr 2009 14:44:19 MDT:
> > I have noticed, though,  that over the last year or  two more and more
> > spam bots are calling back and delivering their spam. Maybe we need to
> > combine greylisting with some kind of  tarpit idea. Where we hold onto
> > their connection for 30-60 seconds before saying, "try back later."
>
> There are  a number  of things  that help  out in  this respect.  If you
> really want to slow down spammers try using something like this:
>
> telnet 166.70.45.22 25
>
> Try talking SMTP to that if you can. :-)
>
> A variant of your holding the connection idea has already been proven to
> work:
>
> http://www.armory.com/~spcecdt/spamware/
>
> For example, impose a 10 second wait  for all hosts and a 30 second wait
> for all hosts that don't have proper reverse DNS. In addition, there are
> other tricks,  like sending an  error if any data  is sent prior  to the
> SMTP 220 greeting banner (aka greetdelay). Like this:
>
> telnet 166.70.45.18 25
>
> If you send HELO  before you see the 220 banner you will  not be able to
> send me email.
>
> Andy
> --
> [-----------[system uptime]--------------------------------------------]
>  12:50pm  up 52 min,  1 user,  load average: 1.08, 1.02, 1.01
>
> /*
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Whoa. My ip's 160.7.244.25. That first IP is an annogram of mine. Trippy.

-- 

Jessie Morris


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