Any of those, self-hosted.
Even regular old self-hosted email, but pin your certificate if you're worried about a Western govt doing a MitM. They have their own root certs trusted by default
Any of those, self-hosted.
Even regular old self-hosted email, but pin your certificate if you're worried about a Western govt doing a MitM. They have their own root certs trusted by default
Checkout Https://delta.chat mate