Honestly if your using tuta tho its no different then proton. Both are crap for different reasons. One has crap privacy enforcement and the other is ran by a dick head.
Seriously it baffles me that anyone thinks a german company is remotely trust worthy for security. Its a fucking joke. Any country that has a deal with five eyes should just be assumed its compromised up front. If theres no out side enforcement of security then any promise of it from the inside is worthless.
E2E encryption doesn't matter when you can't trust the actual host in the first place.