From owner-freebsd-questions@FreeBSD.ORG Fri Mar 5 16:44:23 2010 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 34459106566C for ; Fri, 5 Mar 2010 16:44:23 +0000 (UTC) (envelope-from m.seaman@infracaninophile.co.uk) Received: from smtp.infracaninophile.co.uk (gate6.infracaninophile.co.uk [IPv6:2001:8b0:151:1::1]) by mx1.freebsd.org (Postfix) with ESMTP id 93BFC8FC21 for ; Fri, 5 Mar 2010 16:44:22 +0000 (UTC) Received: from seedling.black-earth.co.uk (seedling.black-earth.co.uk [81.187.76.163]) (authenticated bits=0) by smtp.infracaninophile.co.uk (8.14.4/8.14.4) with ESMTP id o25GiHlV000896 (version=TLSv1/SSLv3 cipher=DHE-RSA-CAMELLIA256-SHA bits=256 verify=NO); Fri, 5 Mar 2010 16:44:17 GMT (envelope-from m.seaman@infracaninophile.co.uk) Message-ID: <4B9134E1.7060501@infracaninophile.co.uk> Date: Fri, 05 Mar 2010 16:44:17 +0000 From: Matthew Seaman Organization: Infracaninophile User-Agent: Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.6; en-GB; rv:1.9.1.8) Gecko/20100227 Thunderbird/3.0.3 MIME-Version: 1.0 To: John References: <20100305125446.GA14774@elwood.starfire.mn.org> <4B910139.1080908@joseph-a-nagy-jr.us> <20100305132604.GC14774@elwood.starfire.mn.org> <20100305154439.GA17456@elwood.starfire.mn.org> <4B912ADC.1040802@infracaninophile.co.uk> <20100305163507.GA18338@elwood.starfire.mn.org> In-Reply-To: <20100305163507.GA18338@elwood.starfire.mn.org> X-Enigmail-Version: 1.0.1 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Virus-Scanned: clamav-milter 0.95.3 at happy-idiot-talk.infracaninophile.co.uk X-Virus-Status: Clean X-Spam-Status: No, score=-1.1 required=5.0 tests=BAYES_00,DKIM_ADSP_ALL, SPF_FAIL autolearn=no version=3.3.0 X-Spam-Checker-Version: SpamAssassin 3.3.0 (2010-01-18) on happy-idiot-talk.infracaninophile.co.uk Cc: mikel king , Programmer In Training , freebsd-questions@freebsd.org Subject: Re: pf overload for SMTP 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: Fri, 05 Mar 2010 16:44:23 -0000 -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 05/03/2010 16:35:07, John wrote: > Is there any reason one couldn't do something similar for SMTP? Maybe > a little wider sample window, like 10/300? Or would you end up blocking > too any things that you don't mean to block? Anyone played with this > for SMTP? You can do this with SMTP, but I'm not sure quite how useful it would be given the different usage patterns for e-mail. (I've applied it quite happly for FTP servers, for example) If you want to do some pf-level antispam stuff, then look at spamd -- in the ports as obspamd to prevent confusion with SpamAssassin's spamd. http://www.openbsd.org/cgi-bin/man.cgi?query=spamd&apropos=0&sektion=0&manpath=OpenBSD+Current&arch=i386&format=html This implements greylisting, greytrapping and teergrube against addresses blacklisted as spam sources. Last I checked it only worked on IPv4 though. It's a fairly light-weight means of eliminating quite a lot of spam, but it should be used in conjunction with other MTA mediated anti-spam techniques, for example SpamAssassin Cheers, Matthew - -- Dr Matthew J Seaman MA, D.Phil. 7 Priory Courtyard Flat 3 PGP: http://www.infracaninophile.co.uk/pgpkey Ramsgate Kent, CT11 9PW -----BEGIN PGP SIGNATURE----- Version: GnuPG/MacGPG2 v2.0.14 (Darwin) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAkuRNOEACgkQ8Mjk52CukIzcGACePJLeg/yorVq8vpVA6Nr7WBbI FksAn0hkNVrOo/m9o5gClh7J7zGoWdvU =JW5l -----END PGP SIGNATURE-----