You can mitigate this risk in the same ways that are already available to you with your current email provider, for example using PGP in your email client. But

You can mitigate this risk in the same ways that are already available to you with your current email provider, for example using PGP in your email client. But that requires configuring with everyone you communicate with. ProtonMail tries to solve this problem but it has its drawbacks. If your email is end-to-end encrypted then you can't do server side search, to search through your email it has to be done on the client. ProtonMail's help page on how to search when all your email is encrypted: https://protonmail.com/support/knowledge-base/search/ https://protonmail.com/support/knowledge-base/search/ FastMail's blog post about why they don't do end-to-end encryption: https://fastmail.blog/advanced/why-we-dont-offer-pgp/ https://fastmail.blog/advanced/why-we-dont-offer-pgp/