Become a paying ProtonMail user, get VPN, Drive and Calendar all encrypted. Pair this with using SimpleLogin-aliases. For paying Proton users, an SL-mail account is included, and you can simply go in to that service using ProtonMail login.

Using aliases like this "stacker.xqk37@slmail.me" and the receiver of your emails won't even know what email service provider you are using. + If you start getting spam, you know who leaked it, and you can just turn off that alias.