Dnia  5.06.2025 o godz. 18:11:03 Daniel R. Nash via mailop pisze:
> The more content the message has the more common the block but its end
> user "eyeball" conversational messages and not managed content. Even
> content such as "This is a test message" is blocked now. All blacklists
> are monitored, and we are clear on all Ips. Being end users we get a
> compromised account every couple of weeks but they are ratelimited to 100
> messages and handled within 6 hours usually. No blocks from any other
> providers.

It's long ago since I sent anything to Gmail, but I was (am) experiencing
that too. It's my long-standing problem with Google. Previously my messages
were accepted, but they landed directly in recipients' Spam folder. Now
they are rejected, which I think is better, because at least I know about
it. But there's no communication anyway.

As in your case, it affects hand-written, person-to-person messages, not
anything automated or mass-sent. Test messages blocked as well. Even my
replies(!) to messages sent to me by Gmail users happen to be blocked.

Except of occasionally being on and off UCEPROTECT L3 (which I have really
no control about), no other blocklists. In fact, being on or off that list
doesn't affect the issue. I have even added my server to DNSWL long ago,
but it doesn't help. Of course SPF/DKIM/DMARC all OK.

I have found also quite long ago that it's Google not "liking" my domain,
because mail from the same server (and from the same IP address) using a
different sender domain went through.

Some peeople here on the list reported similar issues too. I was also
privately contacted by several people who are experiencing the same. Google
is not helpful in solving the issue. I think it just happens with Google
sometimes, nobody knows why and when, and what to do about it...
-- 
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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