As an online business owner, a positive reputation and clients’ trust are significant values that take time and effort to build. Therefore, they must be protected. Because for cybercriminals, those are means to kill two birds with one shot! They approach your clients spoofing your business image to get illegal profits from them.
DMARC record definition.
DMARC or Domain-based Message Authentication, Reporting, and Conformance record is a mechanism to let e-mail senders and recipients identify if an e-mail is truly coming from the sender it claims to be. DMARC also helps to define the actions to take when the e-mail gets authenticated and when it fails the authentication.