From owner-freebsd-isp Sun Dec 9 15:57:23 2001 Delivered-To: freebsd-isp@freebsd.org Received: from fepZ.post.tele.dk (fepz.post.tele.dk [195.41.46.133]) by hub.freebsd.org (Postfix) with ESMTP id A686C37B41C for ; Sun, 9 Dec 2001 15:57:20 -0800 (PST) Received: from arnold.neland.dk ([62.243.77.140]) by fepZ.post.tele.dk (InterMail vM.4.01.03.23 201-229-121-123-20010418) with ESMTP id <20011209235719.EKW395.fepZ.post.tele.dk@arnold.neland.dk>; Mon, 10 Dec 2001 00:57:19 +0100 Received: from localhost (localhost [127.0.0.1]) by arnold.neland.dk (8.11.6/8.11.6) with ESMTP id fB9NwhQ86124; Mon, 10 Dec 2001 00:58:44 +0100 (CET) (envelope-from leifn@neland.dk) Date: Mon, 10 Dec 2001 00:58:43 +0100 (CET) From: Leif Neland To: Javier Henderson Cc: Subject: Re: RBL's and tagging email with sendmail In-Reply-To: <15375.40652.719713.111631@grumman.kjsl.com> Message-ID: <20011210005404.K52959-100000@arnold.neland.dk> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-isp@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.org On Thu, 6 Dec 2001, Javier Henderson wrote: > Hi, > > I've had mixed luck with using the various RBL's out there. The rate > of false positives can be high sometimes, resulting in too many > legitimate messages being bounced. > What do you mean by false positives? A: Blocking on servers which aren't open relays anymore? educate the admins to report to the dnsbl when they have fixed their open relays. B: Blocking on mail which is not spam, but from servers which are open relays? Educate the admins, because they WILL be abused someday, even if they haven't yet. Or if this doesn't help, the users will eventually move to a responsible ISP, making inresponsible ISP's to go out of business. Leif To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-isp" in the body of the message