DMARC is an Internet protocol specification that is going through the IETF standardization process. Providers of more than 3 billion email boxes have taken up DMARC to help put trust back into email. It provides visibility into email flows and can tell receiving servers to delete spoofed messages immediately upon receipt. DMARC provides valuable reporting information about the amount and structure of phishing attacks against a customer population. This data can be used to improve visibility into attacks, decrease takedown times and reduce losses related to account takeover.”]
Source: https://www.darkreading.com/application-security/how-to-reduce-spam-phishing-with-dmarc