yarmak:
> I have implemented such policy server: it lookups MTA-STS policy, caches and
> updates it as RFC 8461 defines.
>
> Github: https://github.com/Snawoot/postfix-mta-sts-resolver
> PyPI: https://pypi.org/project/postfix-mta-sts-resolver/
>
> Daemon lacks some features required by standard like proactive policy fetch,
> reporting and ratelimit, but it serves its main purpose - TLS policy
> discovery. I use it for my personal mailserver. Hope it'll be useful for
> someone.
This may be a good start. Thanks.
Wietse
