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by gnabgib·5y ago·view on hn ↗
It sounds like you're asking for [MTA-STS](https://dmarcian.com/mta-sts/)

"MTA-STS is an inbound mail protocol designed to add a layer of encryption/security between sending and receiving mail servers."(..)

"The MTA-STS protocol works by having a DNS record that tells mail servers to fetch a policy file via HTTPS from a defined subdomain. This file contains a list of the receiver’s mail servers which are authenticated and approved to receive the messages and also what policy to apply to inbound messages."

1 comments
Maybe. Any time we ask a library or client to do HTTP fetches when it historically only did SMTP I become less optimistic about adoption. There are obvious easy wins like Thunderbird and Outlook and those could potentially use a plugin or add-on. Maybe that could be a good start and good enough.