DMARC
Domain-based Message Authentication: a policy that tells email servers what to do with unauthenticated emails.
DMARC (Domain-based Message Authentication, Reporting and Conformance) builds on SPF and DKIM to give domain owners control over what happens when an email fails authentication. Your DMARC policy can tell receiving servers to deliver the email anyway (none), put it in spam (quarantine), or reject it outright (reject). DMARC also sends you reports about who is sending email using your domain, helping you detect spoofing and phishing attempts. It is published as a TXT record at _dmarc.yourdomain.com.
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