Tony Hansen;Dave Crocker;Phillip Hallam-Baker(July 2009).DomainKeys Identified Mail (DKIM) Service Overview.IETF.RFC 5585.https://tools.ietf.org/html/rfc5585.Retrieved 6 January 2016."Receivers who successfully verify a signature can use information about the signer as part of a program to limit spam, spoofing, phishing, or other undesirable behaviors. DKIM does not, itself, prescribe any specific actions by the recipient; rather, it is an enabling technology for services that do."