DMARK email validation

From an article from The Hill, "More than 25 percent of emails from federal email addresses are not actually from the government, according to an email security company with extensive federal contracts. "    One way spoofing is detected and stopped is using

DMARK specification policy , https://en.wikipedia.org/wiki/DMARC,   and https://dmarc.org/,   wouldn't this be useful for email coming into the Cox email servers?