> Fastmail’s spam filtering

I had issues with it early on, and after some back and forth with support they explained to me what is going on: it takes about 200 spam emails before your personalized filter kicks in, before that you might see something slip through. Also, the spam filter updates after you delete emails from your spam folder. Just remember to empty your spam folder, and add some custom rules until you reach that 200 threshold.

5+ years in, everything is working great, nothing to complain, best email provider I've ever used. I only wish they had servers in the EU.