What Does Domain-Based Message Authentication, Reporting and Conformance (DMARC) Mean?

Domain-Based Message Authentication, Reporting and Conformance (DMARC) is a white-list system for email communications meant to limit different types of email-based hacking or fraudulent activities such as email spoofing.

Techopedia Explains Domain-Based Message Authentication, Reporting and Conformance (DMARC)

Part of the idea behind DMARC is that a large percentage of email comes through various network territories of major tech companies and other large firms.