[170258] in North American Network Operators' Group
Re: why IPv6 isn't ready for prime time, SMTP edition
daemon@ATHENA.MIT.EDU (Laszlo Hanyecz)
Tue Mar 25 17:34:03 2014
From: Laszlo Hanyecz <laszlo@heliacal.net>
In-Reply-To: <5331EDAB.8000303@2mbit.com>
Date: Tue, 25 Mar 2014 21:33:41 +0000
To: Brielle Bruns <bruns@2mbit.com>
Cc: nanog@nanog.org
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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.
>>=20
>> CenturyLink is reasonably technically clued so it shouldn't be
>> impossible to get them to fix it.
>=20
>=20
> 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.
>=20
> That would be like outright refusing mail unless it had both SPF and =
DKIM on every single message.
>=20
> Sure, great in theory, does not work in reality and will result in =
lost mail from legit sources.
>=20
> 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.
>=20
> 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.
>=20
> 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.
>=20
>=20
> --=20
> Brielle Bruns
> The Summit Open Source Development Group
> http://www.sosdg.org / http://www.ahbl.org
>=20
