On Thu, Aug 29, 2013 at 1:59 PM, Taral <[email protected]> wrote: > On Wed, Aug 28, 2013 at 12:08 PM, Lucky Green <[email protected]> > 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/
_______________________________________________ The cryptography mailing list [email protected] http://www.metzdowd.com/mailman/listinfo/cryptography
