[mustaphah]

Not ideal - can't disagree. Still, it's the industry leader. I'm not aware of a better spamfilter.

Grey listing doesn't scale; not for me.

[akkartik]

I forward everything including spam to Fastmail. Their spam filter is absolutely fine. This way I don't need to check for false positives in 2 places. You're probably losing one genuine message a year if you don't check your Gmail spam folder.