DMARC

An email standard in which a domain owner uses DNS (glossary)DNS Domain Name System The internet's directory that links domain names to computer addresses. Full definition of DNS to tell receivers how to treat messages that fail authentication, meaning neither SPF (glossary)SPF Sender Policy Framework A DNS record listing the servers allowed to send email for a domain. Full definition of SPF nor DKIM (glossary)DKIM DomainKeys Identified Mail An email signature method whose public key is published in the sender's DNS. Full definition of DKIM passes for the domain. The options are none (monitor only), quarantine (glossary)quarantine A waiting period after cancellation in some ccTLDs when only the former holder can recover the domain. Full definition of quarantine or reject. It also asks receivers to send reports. It helps stop others from sending email that fakes the domain.