DKIM, SPF and DMARC email authentication
DMARC, which stands for “Domain-based Message Authentication, Reporting & Conformance”, is an email authentication, policy, and reporting protocol. It builds on the widely deployed SPF and DKIM protocols,
adding linkage to the author, domain name, published policies for recipient handling of authentication failures, and reporting from receivers to senders,
to improve and monitor protection of the domain from fraudulent email.
For additional information, please visit https://dmarc.org/