On Tue, 25 Mar 2014 22:51:11 -0400, Rob McEwen said: > On 3/25/2014 10:25 PM, Brielle Bruns wrote: > > > > Like I said in a previous response, if you are going to make rdns a > > requirement, why not make SPF and DKIM mandatory as well? > > many ISPs ALREADY require rDNS. So making that standard official for > IPv6 is isn't asking for much! It is a NATURAL progression.
There's still a lot of ancient mail servers out there in v4 land, that were set up before PTRs were pseudo-required by most places, so we end up cutting them some slack under a grandfather clause. There's probably less than a dozen ASNs that have mailservers that speak IPv6 that were deployed before requring PTRs became common, so they have much less of an excuse not to do so....
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