Gmail (thus Nanog) rejecting ipv6 email
Owen DeLong
owen at delong.com
Sun Apr 3 05:18:37 UTC 2022
I’ve not experienced this problem sending emails via IPv6 to gmail destinations from my personal domain.
(delong.com <http://delong.com/>)
Likely this email will, in fact, get sent to GMAIL via IPv6.
I do have good SPF and DKIM records and signing and a reasonable DMARC policy set up.
If ISC doesn’t have that yet, it might be a better alternative than turning off IPv6.
If that doesn’t solve it, I can reach out to someone at Google who can likely get the right parties involved.
Owen
> On Apr 2, 2022, at 15:23, Jeroen Massar via NANOG <nanog at nanog.org> 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)
> - SRS (When forwarding, rewrite the From and resign DKIM, and then ARC-sign that)
> - Decent TLS
> - MTA-STS
>
> And that list grows and grows... and grows and grows. It is kinda a test if one has actually bothered to configure a setup, and not just are randomly sending an email by just telneting from a random server. Of course the large spam outfits have this fully automated and configured, so that their spam^Wadvertising comes through.
>
> A wee little test tells that there are a few improvements to be made at minimum:
>
> https://internet.nl/mail/isc.org/
>
> • Not all authenticity marks against email phishing (DMARC, DKIM and SPF)
> • Failed :Mail server connection not or insufficiently secured (STARTTLS and DANE)
>
>
> Greets,
> Jeroen (who also runs his own full net... and had jeroen at isc for a few years... ;) )
>
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