Date: Wed, 5 Dec 2001 05:04:56 +0100 From: Cliff Sarginson <cliff@raggedclown.net> To: FreeBSD-questions <freebsd-questions@FreeBSD.ORG> Subject: Re: Stopping Spam (was Hi) Message-ID: <20011205050456.A976@raggedclown.net> In-Reply-To: <20011204201408.D3320@twincat.vladsempire.net> References: <20011204161718.A14154@northernbrewer.com> <Pine.BSF.3.96.1011204181513.12930E-100000@fledge.watson.org> <20011204201408.D3320@twincat.vladsempire.net>
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On Tue, Dec 04, 2001 at 08:14:09PM +0000, Josh Paetzel wrote:
> 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.
You took the words right out of my mouth.
1) Checking HELO is worthless
2) Would assume that all the poor sods in the world with
ignorant, stupid, greedy or otherwise incompetent
ISP's were to be denied mail (which is the *major* reason
people want the Internet).
Anyway with a half-decent MTA you can do the equivalent of 2)
yourself. Still won't stop the spam though.
--
Regards
Cliff
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