[170254] in North American Network Operators' Group
Re: why IPv6 isn't ready for prime time, SMTP edition
daemon@ATHENA.MIT.EDU (Brielle Bruns)
Tue Mar 25 16:57:39 2014
Date: Tue, 25 Mar 2014 14:57:15 -0600
From: Brielle Bruns <bruns@2mbit.com>
To: nanog@nanog.org
In-Reply-To: <20140325175603.5423.qmail@joyce.lan>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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
