Date: Mon, 12 Mar 2007 12:00:54 -0400 From: Marcelo Maraboli <marcelo.maraboli@usm.cl> To: John L <johnl@iecc.com> Cc: freebsd-questions@freebsd.org, "Chad Leigh -- Shire.Net LLC" <chad@shire.net> Subject: Re: Tool for validating sender address as spam-fighting technique? Message-ID: <45F57936.3030601@usm.cl> In-Reply-To: <20070311165028.S44863@simone.iecc.com> References: <20070311200829.31802.qmail@simone.iecc.com> <0AC225E6-E55D-4C20-9A00-2EDD95985848@shire.net> <20070311165028.S44863@simone.iecc.com>
next in thread | previous in thread | raw e-mail | index | archive | help
John L wrote: >> I phrased it wrong. You are not responsible for the content, but you >> are responsible for the mail domain and that includes verifying that >> mail is validly from your domain you are responsible for. > > Oh, OK. So if someone sends pump and dump with a chad@shire.net return > address, and I do a callback and your MTA says "yup! that's a 100% valid > address!" then I turn you in to the SEC, rignt? You have now confirmed > that the mail is from you, after all. Or if you haven't, what purpose > did the callback serve? > > There is some reasonable validation technology coming along, most > notably DKIM which which I presume you are familiar. But callbacks are > not it. > I agree..... callbacks are not enough, you can reach a false conclusion, thatīs why I use SPF along with callbacks... on the same message, my MX concludes: "you are sending email "from chad@shire.net", but shire.net says YOUR IP address is not allowed to send email on behalf of that domain, therefore YOU ARE FAKE/FORGED" ..---> reject regards, -- MSc. Marcelo Maraboli Rosselott Jefe Area de Redes y Comunicaciones (Network & UNIX Systems Engineer) Ingeniero Civil Electronico, CISSP (Electronic Engineer, CISSP, MSc.) Direccion Central de Servicios Computacionales (DCSC) Universidad Tecnica Federico Santa Maria phone: +56 32 2654071 Chile. http://www.usm.cl http://elqui.dcsc.utfsm.cl
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?45F57936.3030601>