I don't get much <i>more</i> spam, but there is one obvious spam message that gets inboxed often, even though I've flagged it as Spam and Phishing damn near every time.<p>It is one of those fake UPS messages that there was a package left there unsigned and you have to pick it up. Only instead of UPS, their logo is IPS (for International Parcel Service), which as far as I know, doesn't actually exist.<p>I've been receiving that specific one with different fake tracking numbers every few days for well over a year now. You can bet the spammer/phisher is a paying Google advertiser... that is the <i>only</i> reason I can think of for its overall longevity.
I wonder of spammers are just mass-creating Gmail accounts, getting hit with their own spam and flagging it as "non-spam" to confuse the filters...<p>(If you are in a position to build spamming infrastructure, you are certainly capable of setting automating email accounts for the purpose of unflagging spam.)