I’m extremely satisfied with mailbox.org!
They support all standard email protocols (IMAP, POP3, SMTP) even Sieve for server-side filters, so you can use any mail client you prefer rather than being locked into official apps. They offer CardDAV for contacts and CalDAV for calendars, and their drive can be mounted via WebDAV.
Pricing is reasonable and personal domains are supported.
Isn’t Tuta based in Germany anyway?
What is wrong with WireGuard?