Gmail (thus Nanog) rejecting ipv6 email

Michael Thomas mike at mtcc.com
Sat Apr 2 23:21:09 UTC 2022


On 4/2/22 4:05 PM, John Curran wrote:
> On 2 Apr 2022, at 6:23 PM, Jeroen Massar via NANOG <nanog at nanog.org> 
> wrote:
>> There are a lot of bits and bobs that one has to get right for mail 
>> to flow, amongst which:
>>
>> - IP -> PTR lookup -> that hostname lookup, and match to IP again
>>   (https://en.wikipedia.org/wiki/Forward-confirmed_reverse_DNS)
>> - SPF
>> - DKIM
>> - DMARC
>> - ARC (for mailinglists)
>> - SRS (When forwarding, rewrite the From and resign DKIM, and then 
>> ARC-sign that)
>> - Decent TLS
>> - MTA-STS
>
> Jeroen -
>
>     It is indeed amazing how many protocols we can spin up to address
>     the same underlying problem, time and time again...
>
>     If anyone can anonymously join the mail-sending club and send some
>     email [until bad reputation precludes such], and achieving bad
>     reputation results has no real-world implications, and a new
>     network persona (e.g. domain name) is always available, then the
>     problem could be considered intractable by initial conditions –
>     and no amount of anti-spam protocols (no matter how brilliantly
>     designed and engineered) should be expected to durably address the
>     problem.
>
>     (It might, however, be interesting to do a regression analysis on
>     the spam mitigation protocol introduction dates – it’d be
>     interesting to know if the expected number protocols that will
>     need proper setup in 10, 20, 40 years…!)
>
>
That's why I wrote this:

https://rip-van-webble.blogspot.com/2020/12/are-mailing-lists-toast.html

Trust me, it wasn't for lack of trying on my part.

Mike
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