Gmail is most likely a combination of global and local filters, and most people probably consider the PS Store emails as not spam. I'm not using Gmail, I'm usin

Gmail is most likely a combination of global and local filters, and most people probably consider the PS Store emails as not spam. I'm not using Gmail, I'm using FastMail, so I'm using a local SpamAssassin filter (once you mark enough emails it flips from the global to the local filter). SpamAssassin uses some global data (e.g. URI blacklists and whatnot), but AFAIK the bayesian classification for my incoming email is purely based on my local training.