Dnia 28.02.2025 o godz. 20:45:01 Viktor Dukhovni via Postfix-users pisze:
> > The OP can also wrap an unencrypted connection into stunnel, that should
> > work.
> 
> Mandatory STARTTLS is not unencrypted.  Postfix-to-Postfix over port 587
> is not less secure than over 465.  Just an extra couple of network
> round-trips that don't much matter in email.  Think of it as a less than
> optimal TCP handshake before TLS starts.

The OP insists that he wants to use wrapper mode and not STARTTLS, so I
suggested the solution to do so. Configure stunnel from for example
localhost:10000 to relay_server:465, and set in Postfix config to use just
localhost:10000 as a relay, without STARTTLS at all.

Stunnel is a great tool when you want to make a TLS-wrapped connection from,
or to, something that doesn't support TLS wrapper mode natively :)
-- 
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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