For secure communications it’s much better to use Signal than e-mail. (Preferably with disappearing messages.)
I understand that people desire the UX of an e-mail client such as Thunderbird, Mail.app, Gmail or whatever. Nothing wrong with wanting that. But there is currently no good way to send e-mail securely.
I understand that people desire the UX of an e-mail client such as Thunderbird, Mail.app, Gmail or whatever. Nothing wrong with wanting that. But there is currently no good way to send e-mail securely.