Hi Jon,

Thanks for sharing your experience. With the hosting experience I have until today, it's indeed mostly GMail/Google which is the problem. Although I've had some bad experience trying to get an e-mail (which was assigned to me by my ISP) de-listed from Hotmail/Outlook/Live...

From the DMARC reports I'm receiving, it looks like GMail *may* be becoming more lenient with our domain, although I've been misguided on this topic before (based on the mail system logs, not the DMARC reports). What I did so far was introduction of ARC signing (for the mailing lists), tighten the SPF checking on inbound mail, stop doing sender-callouts and made sure we do SRS sender address rewriting.

Lets hope that the mail flow improves with all these measures. I'm looking into a solution which receives and parses/visualizes the DMARC reports (because forwarding them at the moment does not seem to work for ... Google's DMARC reports).

Regards,

Erik.

On Fri, Jul 19, 2024 at 2:27 PM Jon Boone <ipmonger@delamancha.org> wrote:

I hope you can fix this issue, but I'm not optimistic. I have had my personal domain hosted via Google Workspaces (or whatever they are calling it today) for over a decade and my neighbor across the street has been unable to reliably receive email from me to his Gmail account the entire time, despite other folks on the same email not having that issue.

If you are able to find a reasonable solution, I'd love to hear it.

—jon

On Fri, Jul 19, 2024 at 7:08 AM Erik Huelsmann <ehuels@gmail.com> wrote:
Hi,

In the mail server logs, I found:

2024-07-19 10:39:16 1sUl13-00EJCh-1P ** andy.arvid@gmail.com R=outbound T=remote_smtp H=gmail-smtp-in.l.google.com [2a00:1450:400c:c04::1a] X=TLS1.3:ECDHE_X25519__ECDSA_SECP256R1_SHA256__AES_256_GCM:256 CV=yes: SMTP error from remote mail server after end of data: 550-5.7.1 [2a01:4f8:160:83c4::8 19] Gmail has detected that this message is\n550-5.7.1 likely suspicious due to the very low reputation of the sending\n550-5.7.1 domain. To best protect our users from spam, the message has been\n550-5.7.1 blocked. For more information, go to\n550 5.7.1 https://support.google.com/mail/answer/188131 ffacd0b85a97d-368786b3865si463916f8f.529 - gsmtp

This is from sending my prior mail from a GMail account. The "common-lisp.net" domain has a High (=highest) domain reputation and the IP reputation is not published, but also not referred to. So I can nothing but conclude this must be the @gmail.com address that I'm sending from that's triggering this response?

How can I fight this?!

--
Bye,

Erik.

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