That's what appears to be the case with the Google spoofing. Spammers have turned to a live version of distributing computing, in which people are the ones sharing their processing downtime. Rarely is news about spammers' techniques good; they are usually a step ahead of everyone else. So far, Google is one of the few to keep pace. As someone who has abandoned many email accounts to an overwhelming deluge of junk mail, I certainly hope they can continue to keep up.