On Wed, Jul 28, 2021 at 11:20:03PM -0400, Viktor Dukhovni 
<postfix-us...@dukhovni.org> wrote:

> On Thu, Jul 29, 2021 at 12:18:25PM +1000, raf wrote:
> 
> > And similarly, port 25 will never be TLS-only. STARTTLS
> > isn't going away.
> 
> I am less certain that public Internet SMTP will not in the next decade
> or two switch to STARTTLS required.
> 
> -- 
>     Viktor.

The Rhenus email makes it look like that transition is starting.

cheers,
raf

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