The fight against spam is one of the biggest tasks facing the industry today, and a great deal of time and money has been invested in trying to thwart unwanted email -- but with little real success.

Sender Policy Framework (SPF) takes aim at the practice of return-path spoofing, a technique employed by worms, viruses and other senders of unwanted mail. SPF consists of two parts. First, domain ...

Twenty years ago, Paul Vixie published a Request for Comments on Repudiating MAIL FROM that helped spur the internet community to develop a new way of fighting spam with the Sender Policy Framework ...