Gmail (thus Nanog) rejecting ipv6 email
Michael Thomas
mike at mtcc.com
Sat Apr 2 22:29:29 UTC 2022
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
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