Thanks for the link. I am actually not happy they did not mention this court case in the page I posted above. But the thread you linked also does not clarify the details.

Their clients are open source so you should be able to build them yourself. https://github.com/tutao/tutanota/blob/master/doc/BUILDING.m...

How would that court requirement work ?

>How would that court requirement work ?

Yeah that's the technical detail no judge has any interest in solving ;) ....like upload filters..

If choosing between a German backdoor vs a likely US backdoor, the Germans are probably a better choice for non-Europeans worried about security.

Why? Germany participates as an auxiliary collaborator of the Five Eyes [1] intelligence alliance.

[1] https://fas.org/sgp/crs/intel/R45720.pdf

If the Five Eyes countries and their intelligence services are in your threat model you've likely already lost.

Are you saying ProtonMail has a US back door?

ProtonMail is nominally based in Switzerland, so I would assume that any backdoor in their software is controlled by the Swiss.

Although I see their CTO is based in the US so it is certainly possible.

Probably a poignant time to point out that CryptoAG was based in Switzerland for half a century and highly trusted around the world yet controlled by the CIA the whole time.

https://en.wikipedia.org/wiki/Crypto_AG