From owner-freebsd-questions@FreeBSD.ORG Wed Jun 1 22:01:29 2005 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id A447716A41C for ; Wed, 1 Jun 2005 22:01:29 +0000 (GMT) (envelope-from wmoran@potentialtech.com) Received: from internet.potentialtech.com (internet.potentialtech.com [66.167.251.6]) by mx1.FreeBSD.org (Postfix) with ESMTP id 5D81A43D1F for ; Wed, 1 Jun 2005 22:01:29 +0000 (GMT) (envelope-from wmoran@potentialtech.com) Received: by internet.potentialtech.com (Postfix, from userid 80) id E3D9369A3F; Wed, 1 Jun 2005 18:01:28 -0400 (EDT) Received: from 162.51.224.11 (SquirrelMail authenticated user wmoran) by www.potentialtech.com with HTTP; Wed, 1 Jun 2005 18:01:28 -0400 (EDT) Message-ID: <54466.162.51.224.11.1117663288.squirrel@www.potentialtech.com> In-Reply-To: <8B6C5637-F4B3-4635-94EA-F1B8EE9D8A2F@shire.net> References: <0a6397740f09ea4ac7cce0b1bead3bde@chrononomicon.com> <8B6C5637-F4B3-4635-94EA-F1B8EE9D8A2F@shire.net> Date: Wed, 1 Jun 2005 18:01:28 -0400 (EDT) From: "Bill Moran" To: "Chad Leigh -- Shire.Net LLC" User-Agent: SquirrelMail/1.4.4 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal Cc: FreeBSD Mailing List , Bart Silverstrim Subject: Re: postgrey question X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 01 Jun 2005 22:01:29 -0000 Chad Leigh -- Shire.Net LLC said: > > On Jun 1, 2005, at 8:07 AM, Bart Silverstrim wrote: > >> I've been looking into ways of improving our spam filtering. >> Currently I'm running postfix with amavisd-new (spamassassin and >> clamav), and saw an article on greylisting using postgrey. Turns >> out there's a port for it already in FreeBSD. > > I don't run postifx and the thing I am about to mention I have not > tried yet, but you may want to explore modifying your greylisting to > be based on spamassassin results. > > I use exim as the mta and there is a thing called sa-exim that lets > you run spamassassin at SMTP time so that you can reject mail if you > want before you actually are finished receiving it. The author of sa- > exim has modified it to do greylisting based on spamassassing scores > generated at smtp time, so that you only greylist mail that is > thought to be spam and do not inconvenience your regular users. > > Can you do spamassassin at smtp time with postfix? Yes you can. I recommend this. The postfix docs explain how to do it: http://www.postfix.org/SMTPD_PROXY_README.html I've used this technique and find it very helpful, as it makes bounce messages (caused by spam and viruses) nonexistent. -- Bill Moran Potential Technologies http://www.potentialtech.com