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Date: Thu, 22 Feb 2024 11:13:34 -0500
To: internals <internals@lists.php.net>
Subject: Re: [PHP-DEV] What's up with emails?
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From: php@mjec.net (mjec)

On Thu, 2024-02-22 at 10:29 -05:00, Alain D D Williams <addw@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

They also equivocally indicate a requirement for ARC and a List-Id header.

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.

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.

mjec