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

Domain-based Message Authentication, Reporting, and Conformance(DMARC) is a scalable mechanism by which a mail-originatingorganization can express domain-level policies and preferences formessage validation, disposition, and reporting, that a mail-receivingorganization can use to improve mail handling. Originators ofInternet Mail need to be able to associate reliable and authenticateddomain identifiers with messages, communicate policies about messagesthat use those identifiers, and report about mail using thoseidentifiers. These abilities have several benefits: Receivers canprovide feedback to Domain Owners about the use of their domains; thisfeedback can provide valuable insight about the management of internaloperations and the presence of external domain name abuse. DMARC doesnot produce or encourage elevated delivery privilege of authenticatedemail. DMARC is a mechanism for policy distribution that enablesincreasingly strict handling of messages that fail authenticationchecks, ranging from no action, through altered delivery, up tomessage rejection.