From owner-freebsd-stable Thu Mar 21 8:44: 3 2002 Delivered-To: freebsd-stable@freebsd.org Received: from damnhippie.dyndns.org (12-253-177-2.client.attbi.com [12.253.177.2]) by hub.freebsd.org (Postfix) with ESMTP id 279A537B417 for ; Thu, 21 Mar 2002 08:43:54 -0800 (PST) Received: from [172.22.42.2] (peace.hippie.lan [172.22.42.2]) by damnhippie.dyndns.org (8.11.6/8.11.6) with ESMTP id g2LGhnU39158 for ; Thu, 21 Mar 2002 09:43:49 -0700 (MST) (envelope-from freebsd@damnhippie.dyndns.org) User-Agent: Microsoft Outlook Express Macintosh Edition - 5.01 (1630) Date: Thu, 21 Mar 2002 09:43:50 -0700 Subject: Re: using dnsbl to filter email From: Ian To: freebsd-stable Message-ID: In-Reply-To: <004001c1d087$96018950$0301a8c0@blowfish> Mime-version: 1.0 Content-type: text/plain; charset="US-ASCII" Content-transfer-encoding: 7bit Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG > From: "Hervey Wilson" > Date: Wed, 20 Mar 2002 19:22:09 -0800 > To: "Kutulu" , > Subject: Re: Postfix SMTP server: errors from mx2.FreeBSD.org[216.136.204.119] > > Well that would likely explain the failures ! > > Can anyone recommend an alternative ? I'm currently auditioning a variety of the dnsbl services available. Here's an overview of many of the current services: http://www.declude.com/junkmail/support/ip4r.htm ORDB seems to be very good as an open relays blocker, and I'd estimate that alone blocks about 50-60% of the spam on a user's group server I admin. The other lists that look good to me right now (and have reasonable-seeming policies about listing and delisting, in my opinion) are bl.spamcop.net, and relays.osirusoft.com with a caveat that you have to ignore their dialups listings because they include DSL and cable modem users. (As a cable modem user who runs a responsible secure mail server, I resent being listed.) If you run a server that handles mail for multiple users, deciding to use any BL service can be problematic, there is always collateral damage with such lists, it seems. And you haven't been flamed until you've been flamed by a client/user for "censoring" their email. :-) I'm currently working on a sendmail milter that consults a variety of BLs (configurable) and adds an X-RBL-Advice: header to the mail to report the results to the end user. The users can then have their email clients filter based on the presence of reporting from the BLs that they decide to trust for themselves. It even works when the mail has been forwarded thru several accounts or via a mailing list (it's nice to have no spam in my freebsd list folders every morning now). -- Ian To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message