DMARC has been endorsed by a high umber of individuals and organisations that include:
The National Cyber Security Centre
"Widespread adoption of the DMARC protocol is essential to defend against targeted cyber threats."
Ed Tucker, Head of Cyber-Security at HMRC
“I've been a DMARC supporter for over three years now,”
The UK government have mandated that all government agencies need to be DMARC protected.
US Department of Homeland Security
"On Monday October 16, the Assistant Secretary for Cybersecurity and Communication for the U.S. Department of Homeland Security announced that the Acting DHS Secretary signed Binding Operational Directive (BOD) 18-01 requiring all federal agencies to implement the DMARC protocol across all federal email domains within 90 days. Agencies have until January 16th to adopt DMARC and be at a minimum of policy level “none."