@gvs @adiz "known service providers" -- every email server is a DeltaChat service provider.

Do you think Russia is going to shutdown Yandex to stop people from using DeltaChat on it and cripple their own country's ability to use the internet?

The most they can do is demand all email servers in their jurisdiction block all encrypted emails, period, which requires custom technical solutions for each provider and will have severe consequences as well. Encrypted emails are not as uncommon as people think.

If I work in the government and want to be a whistleblower I could literally use my government email account with DeltaChat. Maybe they'll eventually detect that I'm using it, but they'll never be able to decrypt those messages.