advancedGeneral
DMARC
An email security policy that instructs receiving servers how to handle emails that fail SPF/DKIM checks.
DMARC (Domain-based Message Authentication, Reporting, and Conformance) is an email authentication policy that builds on SPF and DKIM. A DMARC record (published as a TXT DNS record) tells receiving servers what to do with emails that fail SPF or DKIM checks — reject, quarantine, or allow. DMARC also enables reporting, sending aggregate data back to the domain owner about how their domain is being used in email.