Date: 11 Mar 2007 19:44:43 -0000 From: John Levine <johnl@iecc.com> To: freebsd-questions@freebsd.org Cc: chad@shire.net Subject: Re: Tool for validating sender address as spam-fighting technique? Message-ID: <20070311194443.26033.qmail@simone.iecc.com> In-Reply-To: <2B018128-F951-41DF-8EFD-123119E9987C@shire.net>
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>Sender verification works and works well. I suppose that if you define "works" to include mailbombing innocent third parties, then that might be true. I have some fairly heavily forged domains, and on a bad day I see upwards of 300,000 connections from bounces, "validation", and the like attacking the little BSD box under my desk where the MTA is. Gee, thanks a lot. >Sorry, but you conclusion does not follow. Sender verification has >been around for a while and this has not happened in my experience. >Ie, there is no greater use of real FROM addresses than there was >before. What planet have you been on? A few years back spam return addresses were typically complete fakes in nonexistent domains. Now they're picked out of the same victim lists as the targets. I've had to locally blacklist a few places specifically because of all of their abusive verification. If that's what you want, well ... Oh, and the way my MTA is set up, a verification callback doesn't work. But that doesn't keep the clueless from trying. Regards, John Levine, johnl@iecc.com, Primary Perpetrator of "The Internet for Dummies", Information Superhighwayman wanna-be, http://www.johnlevine.com, Mayor "More Wiener schnitzel, please", said Tom, revealingly.
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