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Date:      Fri, 28 Nov 1997 00:04:04 -0600 (CST)
From:      Joel Ray Holveck <joelh@gnu.org>
To:        jkh@time.cdrom.com
Cc:        grog@lemis.com, jmb@FreeBSD.ORG, chat@hub.freebsd.org
Subject:   Re: major push by spammers?
Message-ID:  <199711280604.AAA00737@detlev.UUCP>
In-Reply-To: <18154.880528164@time.cdrom.com> (jkh@time.cdrom.com)
References:   <18154.880528164@time.cdrom.com>

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> 2 ways: The first, if reverse DNS lookup fails, accounts for about 90%
> of the rejects.  When I first started doing this, I worried that
> perhaps I was rejecting some legit emails so for the first couple of
> weeks I'd do one day on, one day off.  In 14 days worth of testing, I
> got one "legitimate" message (though it was unanswerable due to said
> misconfiguration, so I could have done without it :) and many many
> hundreds of spams on the days that I had reverse DNS checking
> disabled.  Needless to say, I can't even imagine not having it on now.

Now tell me, how does the reverse DNS lookup work?  Does it perform a
reverse DNS against the IP source vs. the line sent in EHLO, or what?

-- 
Joel Ray Holveck - joelh@gnu.org - http://www.wp.com/piquan
   Fourth law of programming:
   Anything that can go wrong wi
sendmail: segmentation violation - core dumped



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