Several years ago I tried DeltaChat and it caused an insurmountable problem: my mail provider kept locking me out of my account. Almost certainly it was because DeltaChat's suspiciously ciphertext-filled messages were triggering the abuse lockdown.
The provider was GMX and it was their fault, not DeltaChat's. But I had to call off the experiment.
The provider was GMX and it was their fault, not DeltaChat's. But I had to call off the experiment.