Dnia 14.06.2021 o godz. 09:51:30 Linda Pagillo pisze:
> 
> Any other ideas of what may be causing this?

Is it possible that the client is trying STARTTLS (and not TLS-wrapped SMTP)
on port 465?

Have you tried a different mail client instead of Outlook?
-- 
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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