Do you have Google Postmaster Tools configured for the domain as advised in the complete error message?

It links here: https://support.google.com/mail/?p=UnsolicitedMessageError

Why has Gmail blocked my messages?

Troubleshoot delivery issues with Postmaster Tools

Gmail Postmaster Tools provides senders with metrics on parameters such as reputation, spam rate, feedback loop, etc. It can help you prevent your emails from being blocked or sent to spam by Gmail.


Thank you,

Michael Denney
MDDHosting LLC
https://www.mddhosting.com/

On Dec 27, 2024, at 7:37 AM, Jaroslaw Rafa via mailop <mailop@mailop.org> wrote:

I sent one, literally ONE, and quite important, mail, to Gmail user. I did
NOT send ANY messages to Gmail AT ALL in a week or so.

In reply I got the infamous rejection "Gmail has detected that this message
is likely unsolicited mail.  To reduce the amount of spam sent to Gmail,
this message has been blocked."

This is getting totally ridiculous.
--
Regards,
  Jaroslaw Rafa
  r...@rafa.eu.org
--
"In a million years, when kids go to school, they're gonna know: once there
was a Hushpuppy, and she lived with her daddy in the Bathtub."
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