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FOSS email providers?
(beehaw.org)
If it's free and open source and it's also software, it can be discussed here. Subcommunity of Technology.
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I use Tutanota, which is based in Germany. It's FOSS and it's apparently resistant to decryption by quantum computers, which is impressive. They are also currently working on TutaDrive, which is a quantum-resistant cloud storage provider.
I'll just point out since you highlighted encryption as a selling point for those unaware: Tutanota was court order to build a backdoor against one of their users. Not trying to blame Tutanota specifically, just saying relying on a third part to do the encryption for you is not bulletproof no matter how impressive the encryption sounds.
But you must use their feature -lite apps or webmail and export / backup is clunky. Not all good
To be fair: this is a problem with Proton too.