I've never run a spam filter. Basic greylisting stopped the sheer majority of spam, with no chance of false positives (by definition). My greylisting setup fell

I've never run a spam filter. Basic greylisting stopped the sheer majority of spam, with no chance of false positives (by definition). My greylisting setup fell by the wayside but I haven't bothered to fix it. It's been easy enough to just manually delete spam, most by looking at the sender/subject.