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All these features were already implemented except MinIO/S3. Development progress can be tracked at https://github.com/stalwartlabs/mail-server/tree/main/crates...
https://github.com/simonrob/email-oauth2-proxy
"Just works" I run it with mbsync at the command line.
You do need a client id and some interaction with your O365 admin.
I was hopeful that https://www.nylas.com/ would be the de-facto "adapter" placing a common API surface on top of the major providers and dragging them into a modern-API world. They even had an email client of their own as a proof of concept (forked by one of the original authors as https://github.com/Foundry376/Mailspring - and its reusable core https://github.com/Foundry376/Mailspring-Sync may be interesting to many here). But they've pivoted towards making their API only available behind B2B contracts and opaque pricing, and primarily used for corporate email monitoring and CRM use cases - perhaps because security and privacy considerations are nontrivial. I'm still rooting for them but it's a shadow of what it could have been.
I was hopeful that https://www.nylas.com/ would be the de-facto "adapter" placing a common API surface on top of the major providers and dragging them into a modern-API world. They even had an email client of their own as a proof of concept (forked by one of the original authors as https://github.com/Foundry376/Mailspring - and its reusable core https://github.com/Foundry376/Mailspring-Sync may be interesting to many here). But they've pivoted towards making their API only available behind B2B contracts and opaque pricing, and primarily used for corporate email monitoring and CRM use cases - perhaps because security and privacy considerations are nontrivial. I'm still rooting for them but it's a shadow of what it could have been.
Only servers I'm aware of that support JMAP are Cyrus and James. Clients do seem to be thin on the ground right now, with https://github.com/jmapio/jmap-demo-webmail still being the one to use (as far as I know).
There's software like https://github.com/jmapio/jmap-perl but that seems like more headache than it's worth unless your imap implementation/lib is incredibly complicated.