[sleepingeights]

Either way they're going to be digging through the emails. NSA and I think the US military is allowed to hack into any communication traversing boundaries between countries. And Germany is also part of the alliance of the many eyed spies. You're either going up against NSA/Military grade surveillance that feeds into FBI, DHS, CIA, etc... databases, or going up against "internal" politics and services that does the same.

[medecau]

If your threat model includes NSA you're fucked.

For everything else, use Signal.