From owner-freebsd-questions@FreeBSD.ORG Fri Oct 17 00:01:15 2008 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 809491065677 for ; Fri, 17 Oct 2008 00:01:15 +0000 (UTC) (envelope-from eculp@casasponti.net) Received: from ns2.bafirst.com (72-12-2-19.static.networktel.net [72.12.2.19]) by mx1.freebsd.org (Postfix) with ESMTP id 2F4678FC14 for ; Fri, 17 Oct 2008 00:01:15 +0000 (UTC) (envelope-from eculp@casasponti.net) Received: from casasponti.net ([201.155.7.3]) by ns2.bafirst.com with esmtp; Thu, 16 Oct 2008 19:01:11 -0500 id 000D5302.48F7D5C8.000035BF Received: from localhost (localhost [127.0.0.1]) (uid 80) by casasponti.net with local; Thu, 16 Oct 2008 19:00:36 -0500 id 00130D49.48F7D5A4.00000C06 Received: from dsl-189-190-8-164.prod-infinitum.com.mx (dsl-189-190-8-164.prod-infinitum.com.mx [189.190.8.164]) by intranet.casasponti.net (Horde Framework) with HTTP; Thu, 16 Oct 2008 19:00:36 -0500 Message-ID: <20081016190036.17qwm4xcs6v4408ws@intranet.casasponti.net> Date: Thu, 16 Oct 2008 19:00:36 -0500 From: eculp@casasponti.net To: freebsd-questions@freebsd.org References: <20081016090102.17qwm4xcs6f4so8ok@intranet.casasponti.net> <20081016145255.GA12638@icarus.home.lan> <48F75A88.1000507@infracaninophile.co.uk> <20081016173807.64d0f24e@gumby.homeunix.com.> <20081016175941.GB16235@icarus.home.lan> In-Reply-To: <20081016175941.GB16235@icarus.home.lan> MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; DelSp="Yes"; format="flowed" Content-Disposition: inline Content-Transfer-Encoding: quoted-printable User-Agent: Internet Messaging Program (IMP) H3 (5.0-cvs) X-Remote-Browser: Mozilla/5.0 (X11; U; FreeBSD i386; en-US; rv:1.8.1.17) Gecko/20080925 Firefox/2.0.0.17 X-IMP-Server: 201.155.7.3 X-Originating-IP: 189.190.8.164 X-Originating-User: eculp@casasponti.net Subject: Re: I've just found a new and interesting spam source - legitimate bounce messages 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, 17 Oct 2008 00:01:15 -0000 Jeremy Chadwick escribi=F3: > On Thu, Oct 16, 2008 at 05:38:07PM +0100, RW wrote: >> On Thu, 16 Oct 2008 08:54:55 -0700 (PDT) >> Luke Dean wrote: >> >> > >> > >> > On Thu, 16 Oct 2008, Matthew Seaman wrote: >> > >> > > Until the wonderful day that the entire internet abides by these >> > > rules[*], use >> > > of technologies like SPF and DKIM can discourage but not entirely >> > > prevent the spammers from joe-jobbing you. >> > >> > I just started getting these bouncebacks en masse this week. >> > My mail provider publishes SPF records. >> >> SPF increases the probability of spam being rejected at the smtp >> level at MX servers, so my expectation would be that it would exacerbate >> backscatter not improve it. > > Just a side comment for added clarity: this ultimately depends on how > the mail server administrator implemented SPF. For example, our mail > servers *do not* do SPF lookups at the SMTP level (e.g. in postfix) > because 1) the added complexity is not worth it, and 2) spammers are > now hijacking DNS. > > Instead, our servers use SPF in SpamAssassin, subtracting from > the spam probability score if an SPF record is found and matches > appropriately. That sounds like it is definitely worth trying. Thanks, ed > > -- > | Jeremy Chadwick jdc at parodius.com | > | Parodius Networking http://www.parodius.com/ | > | UNIX Systems Administrator Mountain View, CA, USA | > | Making life hard for others since 1977. PGP: 4BD6C0CB | > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.or= g" >