Date: Sun, 11 Mar 2007 14:56:19 -0500 From: Len Conrad <LConrad@Go2France.com> To: freebsd-questions@freebsd.org Subject: Re: Tool for validating sender address as spam-fighting technique? Message-ID: <20070311203962.SM03288@TX2.Go2France.com> In-Reply-To: <20070311194650.GA92854@xor.obsecurity.org> References: <20070311123142.A326032CD9@radish.jmason.org> <2B018128-F951-41DF-8EFD-123119E9987C@shire.net> <20070311193608.GA92584@xor.obsecurity.org> <C097EA14-200D-4C1F-B2A8-063B808C1C9E@shire.net> <20070311194650.GA92854@xor.obsecurity.org>
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>Perhaps we are talking about different things, I am talking about >systems which send me an email back requiring me to do steps a, b or c >in order to complete delivery of the email. that's challenge/response, which has been widely discredited for years. SAV is a receiving MX probing the MX of sender@domain.tld for verification of sender as known recipient. Len
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