If using email, it usually reveals the real ip address in body of letter.
So if I use delta.chat anyone can find my ip?
There was a fix in the latest version of DC: https://github.com/deltachat/deltachat-core-rust/issues/1728
Could you test the latest version (https://download.delta.chat/android/deltachat-gplay-release-1.12.2.apk) and report if it exposes your IP and if yes, which provider it is?