From owner-freebsd-questions Tue Dec 4 20: 5: 5 2001 Delivered-To: freebsd-questions@freebsd.org Received: from post.mail.nl.demon.net (post-11.mail.nl.demon.net [194.159.73.21]) by hub.freebsd.org (Postfix) with ESMTP id 3DBA937B419 for ; Tue, 4 Dec 2001 20:04:59 -0800 (PST) Received: from [212.238.194.207] (helo=tanya.raggedclown.net) by post.mail.nl.demon.net with esmtp (Exim 3.33 #1) id 16BTIn-000OSd-00 for freebsd-questions@FreeBSD.ORG; Wed, 05 Dec 2001 04:04:58 +0000 Received: by tanya.raggedclown.net (tanya.raggedclown.net, from userid 500) id 5F31C111C; Wed, 5 Dec 2001 05:04:56 +0100 (CET) Date: Wed, 5 Dec 2001 05:04:56 +0100 From: Cliff Sarginson To: FreeBSD-questions Subject: Re: Stopping Spam (was Hi) Message-ID: <20011205050456.A976@raggedclown.net> References: <20011204161718.A14154@northernbrewer.com> <20011204201408.D3320@twincat.vladsempire.net> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20011204201408.D3320@twincat.vladsempire.net> User-Agent: Mutt/1.3.22.1i Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG 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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message