DMARC (Domain-based Message Authentication, Reporting & Conformance) is an enhancement to existing email authentication technologies. Details of the DMARC protocol and related information can be found at dmarc.org. Development of DMARC is still in progress and subject to change. This assistant has been updated based on RFC 7489. Terms used in this assistant are taken from section 6.3 of that document.
Most of the the terms below have mouseovers that provide additional information about their meaning in DMARC.