M3AAWG's email authentication checklist is clear, concise, and timely The Messaging, Malware, and Mobile Anti-Abuse Working Group (M3AAWG) recently published a best-practices document on email authentication (.pdf) based on SPF, DKIM, and DMARC that outlines exactly why authentication is so important, and how to do it right. "Proper email authentication is a foundational principle for establishing trust [...]