The MOST private email service (2021)

E-mail remains an essential backbone of internet communication, with over 4 billion users worldwide. But is it private? Actually it's inherently insecure. Furthermore, the vast majority of users rely on free online email services. Did you know that they use AI algorithms to scan your emails in order to learn more about you? Or that emails are stored in the clear, meaning in the event of a hack, all your emails would be leaked? Do you know what Metadata is and how much is collected by your ema...