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This has been done for some time already via DKIM and DMARC, which anyone can configure.

https://support.google.com/a/answer/174124 https://support.google.com/a/answer/2466580

Thanks for noting this. A lot of discussion about email encryption and security is clearly from the consumer POV, and most people seem to be unaware of things enterprises already do (using commonly available tools & settings) to secure email. Not that it replaces message encryption via S/MIME or PGP, but companies like https://www.mailvelope.com/ and https://www.virtru.com are trying to help with that.

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