I'm a happy user of Fastmail, but I would prefer a properly EU-hosted service. (Fastmail now have data storage in the EU, but much of their infrastructure is in the US and data still passes through there - something that they're open about, but I'd prefer not to happen). The last time I looked at mailbox.org the offer wasn't nearly as good as Fastmail in terms of storage, catch-all email addresses etc, but I took another look recently and it seems to be better. Does anyone here have first-hand experience of mailbox.org?
I use mailboxorg its acceptable.
The webmail has io.ox in the URL so I assume it is hosted ox (www.ox.io of softwares) which is SIGNIFICANTLY worse performance and usability wise compared to the Fastmail webmail -- I don`t use SMTP/IMAP so I do not know what that is like. Routinely on restricted networks that only allow HTTP/HTTPS so it is a webmail only experience opinionated in mine.
As Fastmail themselves have pointed out many times, e-mail is inherently a multi-party activity with both parties holding a copy of the e-mails. Aside from the microscopic amount of people GPGing their e-mail and sending it over good servers, your e-mail is as private as the other party treats it. Which isn't very much. And you can't do anything about that.
You want private and / or anonymous communications? Don't use e-mail.