From owner-freebsd-chat Tue Sep 28 16:14:58 1999 Delivered-To: freebsd-chat@freebsd.org Received: from smtp02.primenet.com (smtp02.primenet.com [206.165.6.132]) by hub.freebsd.org (Postfix) with ESMTP id A35B914FA5 for ; Tue, 28 Sep 1999 16:14:53 -0700 (PDT) (envelope-from tlambert@usr07.primenet.com) Received: (from daemon@localhost) by smtp02.primenet.com (8.8.8/8.8.8) id QAA05233; Tue, 28 Sep 1999 16:14:52 -0700 (MST) Received: from usr07.primenet.com(206.165.6.207) via SMTP by smtp02.primenet.com, id smtpd005159; Tue Sep 28 16:14:43 1999 Received: (from tlambert@localhost) by usr07.primenet.com (8.8.5/8.8.5) id QAA13434; Tue, 28 Sep 1999 16:14:40 -0700 (MST) From: Terry Lambert Message-Id: <199909282314.QAA13434@usr07.primenet.com> Subject: Re: Filtering port 25 (was Re: On hub.freebsd.org refusing to To: brett@lariat.org (Brett Glass) Date: Tue, 28 Sep 1999 23:14:40 +0000 (GMT) Cc: n@nectar.com, freebsd@gndrsh.dnsmgr.net, chat@FreeBSD.ORG In-Reply-To: <4.2.0.58.19990924200154.047b51a0@localhost> from "Brett Glass" at Sep 24, 99 08:08:11 pm X-Mailer: ELM [version 2.4 PL25] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > >I am not advocating making it easy for spammers. The RBL has been a > >huge help, and the DUL looks potentially even more helpful. I just > >object to blocking legitimate traffic. > > The problem is, how can you tell what is legitimate? There's no good > way, a priori, to distinguish spam from legitimate e-mail. It's only > the pattern of mailing and/or the content that gives it away. If someone complains to your postmaster, and can document the offense, and it violates your AUP, then it's not legitimate, and you can terminate your contract with the customer as a result of failure to comply with terms. > Moreover, in order to detect an abusive pattern of mailing, you need > to have logging -- which you get when you channel users' mail through > your server. Transparent proxy, logging limited to not log potentially sensitive information, only traffic analysis; shortlived to make it useless to a court order. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message