From owner-freebsd-chat Mon Dec 30 2: 2:33 2002 Delivered-To: freebsd-chat@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 98DA437B405 for ; Mon, 30 Dec 2002 02:02:31 -0800 (PST) Received: from vienna9.his.com (vienna9.his.com [216.200.68.14]) by mx1.FreeBSD.org (Postfix) with ESMTP id C181843EA9 for ; Mon, 30 Dec 2002 02:02:30 -0800 (PST) (envelope-from brad.knowles@skynet.be) Received: from [10.0.1.5] (shub@[127.0.0.1]) by vienna9.his.com (8.11.6/8.10.1) with ESMTP id gBU6GPf01068; Mon, 30 Dec 2002 01:16:27 -0500 (EST) Mime-Version: 1.0 X-Sender: bs663385@pop.skynet.be Message-Id: In-Reply-To: <3E0E5A93.4060108@quadtelecom.com> References: <3E0DAAF3.7090103@quadtelecom.com> <20021228130209.A79151@getaclue.net> <3E0E5A93.4060108@quadtelecom.com> X-Grok: +++ath X-WebTV-Stationery: Standard; BGColor=black; TextColor=black Reply-By: Wed, 1 Jan 1984 12:34:56 +0100 Date: Sun, 29 Dec 2002 21:48:17 -0600 To: Harry Tabak From: Brad Knowles Subject: Re: Bystander shot by a spam filter. Cc: dever@getaclue.net, freebsd-chat@freebsd.org Content-Type: text/plain; charset="us-ascii" ; format="flowed" Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org At 9:14 PM -0500 2002/12/28, Harry Tabak wrote: >> Any server admin who chooses to use some sort of blocking list >> understands the risks involved - that clean mail may get rejected >> with the dirty. If someone chooses to run a blocking list, they >> should be aware of the consequences of each list. That said, once >> they decide to do so, they do not have to accept your mail - it is >> their server, after all. > > Not necessarily. The implication in the literature is that the > false-positive rate is low. The false-positive rate is relatively low for most black lists, but low != none. It is not possible to have a black list with a zero false-positive rate, because anything you could possibly select on could theoretically be used by an innocent person. The trick with a black list is to set the system up so that it has a "low enough" false-positive rate, and a "high enough" false negative rate. However, what is "low enough" or "high enough" for you may be totally inappropriate for me. All server admins should fully understand these issues when they subscribe to a given black list. Any that do not will run the risk of having criminal negligence charges filed against them. Indeed, many that do fully understand these issues will run the risk of having criminal negligence charges being filed against them. -- Brad Knowles, "They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety." -Benjamin Franklin, Historical Review of Pennsylvania. GCS/IT d+(-) s:+(++)>: a C++(+++)$ UMBSHI++++$ P+>++ L+ !E-(---) W+++(--) N+ !w--- O- M++ V PS++(+++) PE- Y+(++) PGP>+++ t+(+++) 5++(+++) X++(+++) R+(+++) tv+(+++) b+(++++) DI+(++++) D+(++) G+(++++) e++>++++ h--- r---(+++)* z(+++) To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message