I'm amazed at google's spam filters. They catch like 99% of the spam from an email I've probably had for 12 years or so. Every now and then something slips through but it's pretty good. When I look at the spam folder I see I probably get 20:1 spam:legit email.
And gmail spam filters are very bad, in comparison. My own email server gets way less spam than my gmail account, and never any false positives, which are a huge problem on gmail.
On my own mailserver with spamassassin, I had my very first false positive in years just yesterday. It seemed that however the organisation emailing me does it, they're using mail hosts on blocklists.
