I also use FastmIl, have been for over ten years now and zero issues. Recently I’ve been creating a unique email names e.g. apple@mydomain.com to see where spam

I also use FastmIl, have been for over ten years now and zero issues. Recently I’ve been creating a unique email names e.g. apple@mydomain.com to see where spam comes from or if one of the services I sign up with gets breached my main personal email stays clear and I can just kill the unique name. That’s free on Fastmail.