[Ach] TLS survey for SMTP?

[Alice Wonder]

On 06/12/2018 03:09 PM, René Pfeiffer wrote:
> Hello, List!
>
> Has anyone seen a survey/scan/measurement of how many (publicly reachable)
> SMTP servers support TLS? There are sources/scans for this with regards to
> HTTPS, but I'd like to know if someone did the statistics for SMTP as well.
>
> Cheers,
> René.
>

One of the Postfix developers has been keeping some statistics related 
to SMTP servers implementing DANE - Viktor Dukhovni - I'm not sure where 
he makes them available but I think he does.