This memo presents extensions to the Abuse Reporting Format (ARF) and Sender Policy Framework (SPF) specifications to allow for detailed reporting of message authentication failures in an on-demand fashion. This memo updates RFC 4408 by providing an IANA registry for SPF modifiers.
RFC 6652-2012 history
2012RFC 6652-2012 Sender Policy Framework (SPF) Authentication Failure Reporting Using the Abuse Reporting Format