If you want to communicate securely, don't use email. Every email provider in the world is subject to some government authority, and there is not a government on the planet that will allow a service to operate without some provision for surveillance (nor should it!).
But before you move everything to the secret decoder ring, think about what you are actually trying to achieve. Don't want your email to be read by the FBI? Move it to a server in Switzerland and it will be read by the NSA.
I like ProtonMail and I hope they succeed. I find their marketing (explicit or implied) that suggest it protects you against targeted government surveillance annoying and disingenuous.
But before you move everything to the secret decoder ring, think about what you are actually trying to achieve. Don't want your email to be read by the FBI? Move it to a server in Switzerland and it will be read by the NSA.
I like ProtonMail and I hope they succeed. I find their marketing (explicit or implied) that suggest it protects you against targeted government surveillance annoying and disingenuous.