I would push DANE a bit up in the list. DNSSEC can be a drag to some, but it is really the way to go in terms of decentralization of encryption. It is also a good practice.

On 24 Jul 2020, at 12:40, Phil Pennock via mailop wrote:

 * MTA-STS webserver with HTTPS from the same CA, and the relevant
MTA-STS txt file in place; add the DNS record when it's up and happy.

You may find this helpful

https://esmtp.email/tools/mta-sts/

Best regards

-lem

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