Gmail also dumps a lot of non-spam emails into its spam folders. The ones that drive me nuts (and have led me to having to sign up to fastmail for my business

Gmail also dumps a lot of non-spam emails into its spam folders. The ones that drive me nuts (and have led me to having to sign up to fastmail for my business emails, rather than sending from my own shared server) are the ones that are valid responses to emails sent from GMail in the first place. Excellent logic (or lack thereof), Google. I don't actually believe so, but I have often wondered whether GMail has such an overly fastiduous spam filter simply to encourage people into its fold... .