ZDNet Australia: Spammers use e-mail ID to gain legitimacy

Proponents of anti-spam identification schemes have long said that the identifying of a sender is only half of the protection needed to thwart spam, and a new study shows this to be true. Email service provider MX Logic showed that fully a sixth of spam messages it scanned were SPF-compliant, suggesting that spammers are already employing the identification standards even faster than many legitimate email marketers. The other half of the protection must involve a list of good or bad senders that can be used to parse through the identified email.