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X-Original-To: cryptography@metzdowd.com Date: Thu, 29 Aug 2013 22:41:25 -0400 From: Richard Guy Briggs <rgb@tricolour.net> To: Taral <taralx@gmail.com> In-Reply-To: <CAGZkp18tkN8r4+T789qrgXOcjcST3OqYAbSaTeM6Q4gfNMt+Cg@mail.gmail.com> Cc: Cryptography List <cryptography@metzdowd.com>, Lucky Green <shamrock@cypherpunks.to>, Phillip Hallam-Baker <hallam@gmail.com> Errors-To: cryptography-bounces+crypto.discuss=bloom-picayune.mit.edu@metzdowd.com On Thu, Aug 29, 2013 at 01:53:29PM -0700, Taral wrote: > Oh, wait. I misread the requirement. This is a pretty normal > requirement -- your reverse DNS has to be valid. So if you are > 3ffe::2, and that reverses to abc.example.com, then abc.example.com > better resolve to 3ffe::2. Right, so if you have abc.example.com and def.example2.com both pointing to IP1 and IP2, and IP1 and IP2 both point to abc.example.com, what's the problem? > On Thu, Aug 29, 2013 at 1:38 PM, Phillip Hallam-Baker <hallam@gmail.com> wrote: > > On Thu, Aug 29, 2013 at 1:59 PM, Taral <taralx@gmail.com> wrote: > >> On Wed, Aug 28, 2013 at 12:08 PM, Lucky Green <shamrock@cypherpunks.to> wrote: > >> > "Additional guidelines for IPv6 > >> > > >> > The sending IP must have a PTR record (i.e., a reverse DNS of the > >> > sending IP) and it should match the IP obtained via the forward DNS > >> > resolution of the hostname specified in the PTR record. Otherwise, mail will > >> > be marked as spam or possibly rejected." > >> > >> Because under ipv6 your prefix is supposed to be stable (customer > >> identifier) and the namespace delegated to you on request. Have you > >> asked your provider for an ipv6 namespace delegation? > > > > It is a stupid and incorrect requirement. > > > > The DNS has always allowed multiple A records to point to the same IP > > address. In the general case a mail server will support hundreds, possibly > > tens of thousands of receiving domains. > > > > A PTR record can only point to one domain. > > > > The reason that an MX record has a domain name as the target rather than an > > IP address is to facilitate administration. Forcing the PTR and AAAA record > > to match means that there has to be a one to one mapping and thus defeats > > many commonly used load balancing strategies. > > > > Google is attempting to impose a criteria that is simply wrong. > > > > Website: http://hallambaker.com/ > > Taral <taralx@gmail.com> slainte mhath, RGB -- Richard Guy Briggs -- ~\ -- ~\ <hpv.tricolour.net> <www.TriColour.net> -- \___ o \@ @ Ride yer bike! Ottawa, ON, CANADA -- Lo_>__M__\\/\%__\\/\% Vote! -- <greenparty.ca>_____GTVS6#790__(*)__(*)________(*)(*)_________________ _______________________________________________ The cryptography mailing list cryptography@metzdowd.com http://www.metzdowd.com/mailman/listinfo/cryptography
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