rejecting spam at SMTP time (was Re: Postfix anti-antivirus (was Re: [linux-elitists] etc))

Teh Entar-Nick nick@teh.entar.net
Fri Sep 24 08:45:05 PDT 2004


begin  Ron Guerin  quotation:
> On Thu, 2004-09-23 at 14:15, Don Marti wrote:
> > 1. It gives spammers information about messages that
> >    definitely aren't making it through.
> 
> It gives _some_ spammers information about messages that definitely
> aren't making it through.  A large percentage of spammers have no
> idea what messages are getting through and don't care enough to pay
> attention to the SMTP rejection codes, they keep sending their slime
> _after_ the rejection.  Start logging your SMTP sessions and you'll
> see.

	Most spammers use broken return addresses, anonymous open
relays, and treat their payload as "fire and forget".  Of course,
there are exceptions.

	The big problem with greylisting is, of course, your backup
MXes.

-- 
"Some of us figured out in the 1950s                        Nick Moffitt
that blacklists were a bad idea.                      nick@teh.entar.net
Some of us have that lesson still ahead of us."
           -- John Gilmore, on RBLs.



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