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By default, Telegram permanently stores messages on its server, where they could, in theory, be read by the service provider at any time. Threema, on the other hand, rules out the possibility that anyone other than the intended recipient can read messages thanks to end-to-end encryption. After messages are delivered, they are immediately and irrevocably deleted from the Threema server.
А групповые чаты по тому же принципу?
