From owner-freebsd-questions@FreeBSD.ORG Sun Mar 11 19:56:23 2007 Return-Path: X-Original-To: freebsd-questions@freebsd.org Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [69.147.83.52]) by hub.freebsd.org (Postfix) with ESMTP id C535516A400 for ; Sun, 11 Mar 2007 19:56:23 +0000 (UTC) (envelope-from LConrad@Go2France.com) Received: from mgw1.MEIway.com (mgw1.meiway.com [81.255.84.75]) by mx1.freebsd.org (Postfix) with ESMTP id 8C9BA13C45A for ; Sun, 11 Mar 2007 19:56:23 +0000 (UTC) (envelope-from LConrad@Go2France.com) Received: from VirusGate.MEIway.com (virusgate.meiway.com [81.255.84.76]) by mgw1.MEIway.com (Postfix Relay Hub) with ESMTP id D6037471836 for ; Sun, 11 Mar 2007 20:56:25 +0100 (CET) Received: from localhost (localhost.MEIWay.com [127.0.0.1]) by VirusGate.MEIway.com (Postfix) with SMTP id BD0313867C3 for ; Sun, 11 Mar 2007 20:56:30 +0100 (CET) (envelope-from LConrad@Go2France.com) X-AV-Checked: Sun Mar 11 20:56:30 2007 virusgate.meiway.com Received: from mail.Go2France.com (ms1.meiway.com [81.255.84.73]) by VirusGate.MEIway.com (Postfix) with ESMTP id 9BF0C38678A for ; Sun, 11 Mar 2007 20:56:30 +0100 (CET) (envelope-from LConrad@Go2France.com) Received: from TX2.Go2France.com [66.90.247.9] by mail.Go2France.com with ESMTP (SMTPD32-7.07) id AAE41A5200C4; Sun, 11 Mar 2007 20:39:16 +0100 X-Mailer: QUALCOMM Windows Eudora Version 7.1.0.9 Date: Sun, 11 Mar 2007 14:56:19 -0500 To: freebsd-questions@freebsd.org From: Len Conrad 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> <20070311194650.GA92854@xor.obsecurity.org> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; format=flowed Message-Id: <20070311203962.SM03288@TX2.Go2France.com> Subject: Re: Tool for validating sender address as spam-fighting technique? 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: Sun, 11 Mar 2007 19:56:23 -0000 >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