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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'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.