Privacy experts say there are two ways to keep government monitors out of your life. One is to withdraw as much as possible from the wired world. Encrypt your email with S/MIME (Secure/Multipurpose Internet Mail Extensions) Experts are unanimous that end-to-end encryption is essential. Users also should not use any nickname in an email account that could identify them. Even nation-states are taking the Luddite approach in some cases, to avoid generating digital copies of highly sensitive documents.”]
Source: https://www.csoonline.com/article/2133766/8-tips-to-enhance-your-online-privacy.html