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.
Government interception is not part of my threat model for email. Emails may relayed through intermediate servers I can't control and may or may not be encrypted in transit or storage along the way. If I want private communication I'm not going to use email (or probably the internet).
However a service not randomly shutting down or dropping support for open protocols _is_ part of my requirements for an email host.
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)