[giancarlostoro]

Kinda does require the proprietary solution. We do have in the office a paid for Thunderbird plugin (we use Ubuntu unless working on .NET) but for personal use (at home reading work mail) I am limited to using mail on my Macbook Air. Also explaining the process to someone else I know vs just telling them to install an all inclusive mail client that is more seamless would be a different story. Short of telling the whole world to sign up for ProtonMail I would love to see a client that handles email encryption cleanly.