Hello,
> hosts_avoid_tls = *
>
> on your remote SMTP transport. This will ensure that TLS isn't ever
> used on remote outbound deliveries, which can be somewhat resource
> intensive.
I am not so much worried about resources as about not being able to
deliver. But maybe there is some problem their end too. Thank you for the
hint to set hosts_avoid_tls.
As for my other post, I wonder how come I did not notice it was 450. Sorry
and thank you all!
Warm regards,
--
Zbigniew Szalbot