[no subject]

There was actually an article in Linux Journal which referred to them as 
tar pits.  I don't believe it specifically mentioned SMTP, but I could 
be wrong.  As described, it does just what you indicate.  Hold the 
connection open and just waste their time and resources.  I think it was 
a patch to iptables, but again, it's been a while.  I need to dig that 
puppy.

It slows
> down legitimate mail slightly, but the more there are the more it cuts
> into J Random Spammer's deliveries / unit time.  OpenBSD comes with a
> daemon spamd which can be used to accept SMTP from untrusted sources
> that waits 1 second (configurable of course) between each character it
> sends back.  Unknown sending machines can also be set to get a
> temporarily undeliverable error on their first connect; legitimate
> MTAs will attempt to deliver again (and then get the teergrube
> behavior), while most spammers are likely to just move on.
> 


-- 
Until later, Geoffrey


</pre>
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