Domain-based Message Authentication, Reporting, & Conformance (DMARC)

While SPF and DKIM can be used as stand-alone methods, DMARC must rely on either SPF or DKIM to provide the authentication. DMARC (Domain-based Message Authentication, Reporting, & Conformance) builds on those technologies by providing directions to the receiver on what to do if a message from your domain is not properly authenticated.