Date: Wed, 6 Aug 2003 09:51:15 -0700 From: Bill Campbell <freebsd@celestial.com> To: questions@freebsd.org Subject: Re: ISPs blocking SMTP connections from dynamic IP address space Message-ID: <20030806095115.B18052@barryg.mi.celestial.com> In-Reply-To: <19175993.1060169841@[192.168.10.11]>; from pea@andrewpea.com on Wed, Aug 06, 2003 at 11:37:21AM -0500 References: <Pine.BSF.4.05.10308061232270.1659-100000@buffnet5.buffnet.net <Pine.BSF.4.05.10308061232270.1659-100000@buffnet5.buffnet.net> <19175993.1060169841@[192.168.10.11]>
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On Wed, Aug 06, 2003 at 11:37:21AM -0500, Bruce Pea wrote: >--On Wednesday, August 06, 2003 12:33 PM -0400 Steve Hovey ><shovey@buffnet.net> wrote: >> >> Unfortunately, dynamic usually means not a business - which often means >> spam - and we are all losing hair over the war on spam. >> >> I now block ip's with no reverse dns > >We are doing this as well. We get a fair number of complaints from people >who's mail doesn't get delivered but we tell them to fix their DNS so we >know someone isn't trying to spoof us. So far, 23 out of 25 organizations >complaining have fixed their DNS. We started blocking on no rDNS several months ago, and it's been extremely effective with low false positive problems. I heard that AOL started refusing connections with no rDNS about a month ago which makes it easier to justify our policies to the clueless. Bill -- INTERNET: bill@Celestial.COM Bill Campbell; Celestial Software LLC UUCP: camco!bill PO Box 820; 6641 E. Mercer Way FAX: (206) 232-9186 Mercer Island, WA 98040-0820; (206) 236-1676 URL: http://www.celestial.com/ Instead of giving money to found colleges to promote learning, why don't they pass a constitutional amendment prohibiting anybody from learning anything? If it works as good as the Prohibition one did, why, in five years we would have the smartest race of people on earth. -- The Best of Will Rogers
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