IETF Logo Mail Archive

Re: [apps-discuss] Comments on draft-ietf-appsawg-greylisting-03

Tony Finch <dot@dotat.at> Thu, 16 February 2012 12:29 UTC

Return-Path: <fanf2@hermes.cam.ac.uk>
X-Original-To: apps-discuss@ietfa.amsl.com
Delivered-To: apps-discuss@ietfa.amsl.com
Received: from localhost (localhost [127.0.0.1]) by ietfa.amsl.com (Postfix) with ESMTP id 0CC1D21F861A for <apps-discuss@ietfa.amsl.com>; Thu, 16 Feb 2012 04:29:26 -0800 (PST)
X-Virus-Scanned: amavisd-new at amsl.com
X-Spam-Flag: NO
X-Spam-Score: -6.32
X-Spam-Level:
X-Spam-Status: No, score=-6.32 tagged_above=-999 required=5 tests=[AWL=0.279, BAYES_00=-2.599, RCVD_IN_DNSWL_MED=-4]
Received: from mail.ietf.org ([12.22.58.30]) by localhost (ietfa.amsl.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id xTihavescEGu for <apps-discuss@ietfa.amsl.com>; Thu, 16 Feb 2012 04:29:21 -0800 (PST)
Received: from ppsw-50.csi.cam.ac.uk (ppsw-50.csi.cam.ac.uk [131.111.8.150]) by ietfa.amsl.com (Postfix) with ESMTP id 5D79F21F84EA for <apps-discuss@ietf.org>; Thu, 16 Feb 2012 04:29:21 -0800 (PST)
X-Cam-AntiVirus: no malware found
X-Cam-SpamDetails: not scanned
X-Cam-ScannerInfo: http://www.cam.ac.uk/cs/email/scanner/
Received: from hermes-2.csi.cam.ac.uk ([131.111.8.54]:60291) by ppsw-50.csi.cam.ac.uk (smtp.hermes.cam.ac.uk [131.111.8.157]:25) with esmtpa (EXTERNAL:fanf2) id 1Ry0Se-000542-qS (Exim 4.72) (return-path <fanf2@hermes.cam.ac.uk>); Thu, 16 Feb 2012 12:29:20 +0000
Received: from fanf2 (helo=localhost) by hermes-2.csi.cam.ac.uk (hermes.cam.ac.uk) with local-esmtp id 1Ry0Se-0001KX-79 (Exim 4.67) (return-path <fanf2@hermes.cam.ac.uk>); Thu, 16 Feb 2012 12:29:20 +0000
Date: Thu, 16 Feb 2012 12:29:20 +0000
From: Tony Finch <dot@dotat.at>
X-X-Sender: fanf2@hermes-2.csi.cam.ac.uk
To: SM <sm@resistor.net>
In-Reply-To: <6.2.5.6.2.20120215194417.098a0438@elandnews.com>
Message-ID: <alpine.LSU.2.00.1202161221020.31357@hermes-2.csi.cam.ac.uk>
References: <6.2.5.6.2.20120215194417.098a0438@elandnews.com>
User-Agent: Alpine 2.00 (LSU 1167 2008-08-23)
MIME-Version: 1.0
Content-Type: TEXT/PLAIN; charset="US-ASCII"
Sender: Tony Finch <fanf2@hermes.cam.ac.uk>
Cc: apps-discuss@ietf.org
Subject: Re: [apps-discuss] Comments on draft-ietf-appsawg-greylisting-03
X-BeenThere: apps-discuss@ietf.org
X-Mailman-Version: 2.1.12
Precedence: list
List-Id: General discussion of application-layer protocols <apps-discuss.ietf.org>
List-Unsubscribe: <https://www.ietf.org/mailman/options/apps-discuss>, <mailto:apps-discuss-request@ietf.org?subject=unsubscribe>
List-Archive: <http://www.ietf.org/mail-archive/web/apps-discuss>
List-Post: <mailto:apps-discuss@ietf.org>
List-Help: <mailto:apps-discuss-request@ietf.org?subject=help>
List-Subscribe: <https://www.ietf.org/mailman/listinfo/apps-discuss>, <mailto:apps-discuss-request@ietf.org?subject=subscribe>
X-List-Received-Date: Thu, 16 Feb 2012 12:29:26 -0000

SM <sm@resistor.net> wrote:
>
>  'Another, less well-developed, application of greylisting is
>   to delay mail from newly seen IP addresses on the theory that, if
>   it's a spam source, then by the time it retries, it will appear in a
>   list of sources to be filtered, and the mail will not be accepted.'
>
> This is actually one of the first and well-developed application of
> greylisting (see http://projects.puremagic.com/greylisting/whitepaper.html ).
> I recommend adding a reference to the paper as the author proposed the
> technique.

Perhaps the author of that paper proposed the name: the technique is at
least five years older. See for instance http://www.gnu.org/software/sauce/

  "Mail from previously-unknown sources is delayed to give them a chance
   to try a bait address or get their account cancelled."

Tony.
-- 
f.anthony.n.finch  <dot@dotat.at>  http://dotat.at/
Faeroes, South-east Iceland: Westerly or northwesterly, backing southwesterly,
5 to 7, increasing gale 8 at times. Rough or very rough, occasionally high.
Squally wintry showers. Good, occasionally poor, becoming very poor at times.

v2.23.0 | Report a Bug | By Email