On 2016.03.31 03:02, Sam Varshavchik wrote: > 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. >
I doubt there is evil intent in Google's configuration. Much more plausible is version that they simply have the same requirements for v6 connections as they have for v4. I believe most of courier-mta users did not made any action to treat v6 more flexibly. So, why we should expect google do that? Speaking about reverses. ISPs can use wildcard reverse records in the /64 block. This way their process is very little different than assigning reverse to a single IPv4 address they have given to a customer. How much of ISPs do that I don't know -- mine still not provide native IPv6 connectivity. So I live on 6to4. But even in this case my servers do have reverses and successfully get and submit messages to google servers over IPv6. IPv6 is from the very begining was designed to assign numerous addresses to an interface. Therefore it would be wise to assign special service address (say, PREFIX::25) to an SMTP server. So it does not change when you change hardware. And in this case your ISP can fall back to old process of adding a record in reverse zone. -- Aidas Kasparas IT administrator GM Consult Group, UAB +370 686 08473 http://www.gmc.lt ------------------------------------------------------------------------------ Transform Data into Opportunity. Accelerate data analysis in your applications with Intel Data Analytics Acceleration Library. Click to learn more. http://pubads.g.doubleclick.net/gampad/clk?id=278785471&iu=/4140 _______________________________________________ courier-users mailing list courier-users@lists.sourceforge.net Unsubscribe: https://lists.sourceforge.net/lists/listinfo/courier-users
