Web based encryption. Pointless. If you trust them enough not to send you bad Javascript, you trust them not to read your emails. You trust them with your private keys.
If you trust them with all that why even encrypt the mail client side?
If you trust them with all that why even encrypt the mail client side?
https://www.reddit.com/r/ProtonMail/comments/77ifdx/protonma...
https://www.mozilla.org/en-GB/thunderbird/
Also, the V1.0 release of Mailpile is meant to be coming soon:
https://github.com/mailpile/Mailpile
For setting up your own email server...