Re: Gmail (thus Nanog) rejecting ipv6 email

[Michael Thomas <mike () mtcc com>]

On 4/2/22 3:23 PM, Jeroen Massar via NANOG wrote:
> Hi Dan,
>
> Hope the rest of the world is treating you decently!
>
> 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)

Seriously spend zero time on ARC. It doesn't work as advertised and is 
basically snake oil.

Mike