FWIW I moved to FastMail from Gmail about three years ago and one of my main worries then was that I’d be inundated with spam when I didn’t have google’s filter

FWIW I moved to FastMail from Gmail about three years ago and one of my main worries then was that I’d be inundated with spam when I didn’t have google’s filter to keep things clean. Since then I think I’ve only had one spam message come through to my inbox, and one or two that were incorrectly classified as spam. My worries were unfounded, as it turns out. (No affiliation with fastmail, just a customer.)