And why would I share my email with an app, if I can just use Nostr DMs or create a chat here? And if not Nostr, there is e.g. Session.
#NationalSwitchDay
#DeltaChat
https://delta.chat/ by nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqzgymqfyt0t0wm3ws2qvcp9vxtau4pzlftmr8h6qdjg6608wpjs2skjg4yp
It's open source, encrypted, and more importantly perhaps, not associated with Meta in any way.
And it's also décentralized, doesn't ask for a new sign in, a phone number or anything else. And you probably already have an account on it : your own email (https://providers.delta.chat/)

Discussion
nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpqp2gm7rxun7r3ue0jahs9wrle6n7ze7rm9j9p9mny0awzm3fcyhqqgq2xpz nostr:nprofile1qy2hwumn8ghj7un9d3shjtnddaehgu3wwp6kyqpq4ysr4xwrmflhdx96587w9dvcfp5zdqfflxhfs8xmm8ze9wzgua5szw7l5c the app works like a local email client, you are not sending your email address to any 3rd party server, it is similar to using #Thunderbird, that said, you don't need to use your #email address, you can login anonymously using #chatmail servers that basically provide you similar advantages to #Nostr and #Session
ok, thank you