Does ProtonMail have a feature similar to the "full inbox encryption" [1] mailbox has? Also, there are some nice features in mailbox, like only allowing to send email to other servers which support encryption [2].

I'm genuinely curious if ProtonMail has similar functionality on offer, especially since it appears to be free.

[1] https://support-en.mailbox.org/knowledge-base/article/the-en...

[2] https://mailbox.org/en/ensuring-emails-are-sent-securely/

edit: links