Dnia 29.07.2024 o godz. 22:25:37 Viktor Dukhovni via Postfix-users pisze:
> It was a response from a remote server refusing to accept delivery,
> so, the fix (if not already in place) is:
> 
>     smtp_tls_security_level = may
> 
> however, the remote server might be one of the broken ones both require
> and fail to offer STARTTLS, in which the OP is out of luck.  More
> detailed logs can tell the full story.

Isn't there any possibility to use a dedicated transport to such a broken
server, with settings that force use of TLS to deliver the message
regardless of target server not advertising 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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