From owner-freebsd-questions  Tue Dec  4 18:14:15 2001
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Date: Tue, 4 Dec 2001 20:14:09 +0000
From: Josh Paetzel <friar_josh@webwarrior.net>
To: doug <doug@safeport.com>
Cc: FreeBSD-questions <freebsd-questions@FreeBSD.ORG>
Subject: Re: Stopping Spam (was Hi)
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References: <20011204161718.A14154@northernbrewer.com> <Pine.BSF.3.96.1011204181513.12930E-100000@fledge.watson.org>
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In-Reply-To: <Pine.BSF.3.96.1011204181513.12930E-100000@fledge.watson.org>; from doug@safeport.com on Tue, Dec 04, 2001 at 07:06:53PM -0500
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On Tue, Dec 04, 2001 at 07:06:53PM -0500, doug wrote:
> While on this subject; I have a question. More than 3/4's of the UBE I
> receive could be stopped if relays refused mail from bogus addresses,
> i.e., forward and/or reverse DNS of the submitting mail server does not
> work/match
> 
> My point is not to start a philosophical discussion on the finer points of
> doing this, but rather as a practical manner it is so easy and much more
> practical than writing endless regexp's and/or adding 1(0){1,5}s (did I do
> that right? :) of IP addresses. 
> 
> Why not have available as an option to:
> 
>   1) kill/deny at the HELO
>   2) run the 'Received: from' chain and kill/deny based on DNS

1) HELO is so easily faked, that there's no point even looking at it.
2) You run into a lot of people who don't have working reverse DNS and 
   lose legitimate mail.


Josh


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