I'm glad to hear that I will have to take a closer look. Classical encryption is still a deal breaker though because of Store Now Decrypt Later attacks, SimpleX uses the double ratchet algorithm developed by signal, maybe DeltaChat could too idk if that's helpful.
#FLOSS #E2EE #PSA #Privacy #Anonymity #SimpleX #Signal #DeltaChat #QuantumResistantEncryption