When I was using fastmail, I got lots of spam and I couldn't figure out how to get less. The spam was the reason I stopped using it and went back to gmail prima

When I was using fastmail, I got lots of spam and I couldn't figure out how to get less. The spam was the reason I stopped using it and went back to gmail primarily. (This was a year or 1.5 ago.) I liked everything else about their service, though.