Is Skiff email roughly the same as Mailbox.org when it comes to privacy?

I understand that [mailbox.org](https://mailbox.org) ***cannot*** rival Tutanota or ProtonMail when it comes to privacy. I do use ProtonMail as well (like many, I have more email clients), but I also am a Mailbox user, which I use for my **small business, my own custom domain and AnonAddy forwards.**

I do like Skiff for their sleek Notion-like interface and their UI + I've heard the search is good, hence I am thinking of moving **from Mailbox to Skiff** with my custom …

domain interface moving privacy proton search skiff thinking tutanota