Ángel González writes:
Sam Varshavchik wrote: > But this is treating the symptom, rather than the ailment. I think if > you set up an SPF record, Google will be more receptive to your mail. > > Additionally, what Google does or does not do has no bearing on > sending mail to anyone else, so if you're having problems with other > mail destinations, you need to take a closer look at your networking.Rather than the spf (which is a record to tweak when enabling ipv6), I suspect Mark's ipv6 address might not have a rdns to his own domain, and the domain a AAAA to the one.
As I understand it, IPv6 addresses are assigned in /64s to endpoints. Your hosts' MAC addresses form the second half of the IPv6 address, by default.
As such, in order for IPv6 reverse DNS to work, your internet provider has to delegate reverse DNS to you. I'm skeptical that most ISPs will have established processes for doing that, so reverse DNS for IPv6 addresses seems to be a problematic proposition, and Google insisting on reverse DNS for connecting IPv6 addresses appears to be intended to stymie everyone but large ISPs from sending mail to Google.
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