I don't think the blog post is accurate, see [1]. From the three providers mentioned above (fastmail/mailbox/runbox) which I have experience with, fastmail has by far the best ui, speed and feel (atm).

As with gmail the fastmail provider does read your email content to provide e.g. search (and in case of gmail who knows what more?). Both will hand out information with a lawful warrant. -- And as long as the government is reasonably sane [2] that's perfectly fine with me.

[1] https://fastmail.blog/2018/12/21/advocating-for-privacy-aabi... [2] otherwise I'd try ProtonMail (but it has a price in useability)