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Not one, but a handful, in no particular order. Mozilla Apple Posteo.de (and similar email providers) Signal app (though the app quality is very poor) Matr
by newscracker 7y ago
Not one, but a handful, in no particular order.
Mozilla
Apple
Posteo.de (and similar email providers)
Signal app (though the app quality is very poor)
Matrix.org
SpiderOak
DuckDuckGo