[bigshell]

I personally feel that calling Proton Mail or Tutanota end-to-end encrypted is sort of misleading. Sure, they may have the contents of your mailbox encrypted but in transit they can see your email in plain text and so can the recipient's mail server. If you desire E2EE I highly recommend using GPG or Signal.

[piaste]

I don't know about the Protonmail UX, but the Tutanota apps at least make it very clear when sending an email whether you're using E2E or just plain unencrypted mail. (If you leave it on E2E and try to email a non-Tutanota account, it will ask you for a pre-shared password with which to encrypt the message.)