Dnia 25.09.2025 o godz. 17:37:18 lejeczek via Postfix-users pisze:
> Inasmuch I do not, well, did not until now, use 465 but I've been
> using - not with Ceph though - 587 all the time.
> Is it ok to assume that, that part - 587 - of the config is good and
> it's only Ceph which is incapable to of working with that?

I guess that the crucial point is the message in your Postfix logs
"improper command pipelining", that's why Wietse instructed you to set the
option "smtpd_forbid_unauth_pipelining=no" which solved the issue.

It looks like Ceph is "pipelining" the SMTP commands when submitting mail,
ie. sends one command after the other without waiting for reply from Postfix
server - while the other software you are using to send mail apparently
behaves correctly and waits for reply before sending the next command.

So as long as you don't use any other software that "pipelines" the commands
when sending mail, you should be good to go.
-- 
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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