Milter-greylist

Petar Bogdanovic wrote:
>
> >
> > If milter-greylist scales to high, that may not be the case any longer.
>
> SpamAssassin is pretty popular too, but still (after nearly a decade of
> being freely available on SourceForge) very effective..
>
> Petar Bogdanovic
>
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It's fascinating that milter-greylist still works as well as it does.  
It seems like it would be trivial for a spammer to make multiple 
attempts, and many do.  Do a lot of ips end up on blacklists before they 
can try again?  It seems like a lot of blacklists are very slow to log 
new spammers.  For instance I have week old spam whose ips aren't on 
spamhaus yet. 

But then again I definitely don't understand the economics of spam.  I'm 
guessing that a lot of spammers are themselves victims of scams.  
Something like "pay us a hundred bucks, reach millions of customers" or 
"make millions with internet marketing."  At this point, no products 
actually get sold via spam, the product is the spam itself.  Just 
guessing.  If that's the case there may be an actual disincentive to 
bypass spam filters because you don't want your customers getting shut 
down very quickly.  Just let them think everything's going fine.

I guess malware is a different issue, but is anybody still stupid enough 
to click on a spam link?  I still believe the biggest spam activity 
targets the actual spammers themselves.