Poor Rates of DMARC Adoption Help Perpetuate Email Spoofing
Analysis performed of domains used by Fortune 500 companies, U.S. government agencies, and other major organizations reveal nearly 80 percent don’t use DMARC, or Domain-based Message Authentication, Reporting & Conformance. It is a protocol that works on top of email servers that already support the Sender Policy Framework (SPF) and DomainKeys Identified Mail (DKIM). It lets email server administrators put policies in place that can detect when an incoming email is lying about its real "From:" address.