Fastmail's spam filter is great if you are willing to put some minor effort. Read this: https://www.fastmail.help/hc/en-us/articles/1500000278142-Im...

Fastmail works great for me. I do not miss any emails as junk nor do i get any junk in my inbox because of using the methods explained in the link above.

Controlling your own email address is the way to go. It takes consistent effort to migrate but worth it when it is done.