check http://dnsviz.net/d/5.2.0.0.0.0.0.0.0.0.0.0.0.0.0.0.4.7.2.0.0.1.0.0.0.0.0.1.5.0.4.2.ip6.arpa/dnssec/
On Thu, Dec 3, 2015 at 4:14 PM, Ted Cooper <ml-mailop...@elcsplace.com> wrote: > I'm starting to conclude that attempting IPv6 delivery to gmail servers > is simply not worth the electrons. > > Understandably, gmail have rules in place for the PTR/AAAA RR of sending > IPv6 addresses. I have no issue with these, as setting them up is > MailServers-100 (Not even the 101) and, I use such checks as an > indicator myself. Nothing says "I'm a real mail server!" than taking the > effort to look like one. > > The issue arises when Google's end has a DNS hiccup and decides that our > perfectly configured PTR/AAAA no longer exists, and instead of using any > kind of reputation or memorised state, flat out rejects all emails until > nxcache expires for that server. By the time I check what is going on, > the problem is solved with emails delivering normally. > > After testing for many months from multiple locations, I have never > managed to replicate a permanent DNS failure of either the PTR or AAAA > lookup. I know at some point, there has to be a missing packet or > routing issue which prevents a lookup succeeding, but that will always > be temporary. > > For now, I'm ignoring all IPv6 addresses when delivering to gmail.com > but that hardly seems like a positive step forward. > > These are hosted sending domains so attempting to get everyone setup > with, and working within the limitations of, DKIM and SPF is > impractical. Sending without either of these two works just fine in > almost all cases. > > Why the heck are Google hard rejecting emails with a temporary DNS issue > which has previously been just fine? How on earth does one work around > such an issue? > > > > > _______________________________________________ > mailop mailing list > mailop@mailop.org > https://chilli.nosignal.org/cgi-bin/mailman/listinfo/mailop >
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