On Thu, 22 Feb 2024, mjec wrote:
On Thu, 2024-02-22 at 10:29 -05:00, Alain D D Williams <a...@phcomp.co.uk>
wrote:
On Thu, Feb 22, 2024 at 09:05:22AM -0500, Derick Rethans wrote:
Gmail is rejecting emails after we moved the servers without telling
us why, in enough detail to do anything about it.
I run other mail lists and have had similar problems with gmail
recently.
Gmail explicitly tightened their requirements for senders this month,
so while it's likely the server change is related, it may not be the
entire cause.
Specifically, they require:
- valid spf, with specific rules for quarantining email that has @gmail.com
From but doesn't pass spf
- valid dkim
- dmarc configured if the server sends more than 5k emails to Gmail
We should have all of that though?
They also equivocally indicate a requirement for ARC and a List-Id header.
We have a List-Id header, but I've not even heard of ARC. It is on our
list to investigate though. Our SMTP logs definitely don't say anything
about this though.
This is all at https://support.google.com/a/answer/81126.
I think ARC is a must; without it we'll never get to passing dkim at
least, even if we rewrite from so spf passes.
But SPF is now passing? The postmaster tools show this:
Date DKIM success rate SPF success rate DMARC success
rate
15 Feb 2024 100.0% 100.0% 0.0%
16 Feb 2024 100.0% 100.0% 0.0%
17 Feb 2024 100.0% 100.0% 0.0%
18 Feb 2024 100.0% 100.0% 0.0%
19 Feb 2024 100.0% 100.0% 100.0%
20 Feb 2024 100.0% 100.0% 100.0%
I'm happy to pitch in to help getting this configured if that's
helpful, though I'm also very conscious that too many cooks is often a
greater harm than good when it comes to administration. But reach out
if you think I can be helpful.
We could definitely use some people that now email delivery.
cheers,
Derick
