@Katsudon @kezzbracey Technically speaking, Fastmail is the best option by far. Mailbox is in theory way more secure being in Germany, but some parts of their service is horrible.
They don't have app passwords and if you activate 2FA your password is suddenly "<PIN-code><one time password>" and your regular password is only used by e-mail clients.
The UI is messy and it's designed by someone who never took a course in UX design and fails everything in regard to accessibility and logic.