Re: why IPv6 isn't ready for prime time, SMTP edition

[Laszlo Hanyecz <laszlo () heliacal net>]

The usefulness of reverse DNS in IPv6 is dubious.  Maybe the idea is to cause enough pain that eventually you fold and 
get them to host your email too.

-Laszlo


On Mar 25, 2014, at 8:57 PM, Brielle Bruns <bruns () 2mbit com> wrote:

> On 3/25/14, 11:56 AM, John Levine wrote:
> > I think this would be a good time to fix your mail server setup.
> > You're never going to get much v6 mail delivered without rDNS, because
> > receivers won't even look at your mail to see if it's authenticated.
> >
> > CenturyLink is reasonably technically clued so it shouldn't be
> > impossible to get them to fix it.
>
>
> Nothing wrong with my mail server setup, except the lack of RDNS. Lacking reverse should be one of many things to 
> consider with rejecting e-mails, but should not be the only condition.
>
> That would be like outright refusing mail unless it had both SPF and DKIM on every single message.
>
> Sure, great in theory, does not work in reality and will result in lost mail from legit sources.
>
> Already spoken to CenturyLink about RDNS for ipv6 - won't have rdns until native IPv6.  Currently, IPv6 seems to be 
> delivered for those who want it, via 6rd.
>
> And, frankly, I'm not going to get in a fight with CenturyLink over IPv6 RDNS, considering that I am thankful that 
> they are even offering IPv6 when other large providers aren't even trying to do so to their residential and small 
> business customers.
>
> It is very easy for some to forget that not everyone has a gigabit fiber connection to their homes with ARIN assigned 
> IPv4/IPv6 blocks announced over BGP.  Some of us actually have to make do with (sometimes very) limited budgets and 
> what the market is offering us and has made available.
>
>
> -- 
> Brielle Bruns
> The Summit Open Source Development Group
> http://www.sosdg.org    /     http://www.ahbl.org