The emails sent with Tutanota are end-to-end encrypted. That means the encryption process takes place locally at the sender and the decryption process takes place locally at the recipient. While being send through the internet all data (subject, content, attachments) are end-to-end encrypted.
S01E07 : To change the future, click here
Based on the data collected from Do Not Track’s users, we have predicted three possible outcomes for society. And yet the one constant about the future is that it's not written: it is all still up to us.