DomainKeys Identified Mail (DMARC)

socUnderstanding DomainKeys Identified Mail (DMARC)

DMARC creates a common framework using both SPF and DKIM protocols for authentication It specifies whether a domain is using SPF, DKIM, or both protocols for authentication.

One main benefit of employing a DMARC policy is that senders receive DMARC reports, which provide the following information:

  • Which servers and third parties are sending mail to your specific domain.
  • The ratio of emails that pass DMARC.
  • What servers or third parties are sending emails that failed DMARC.
  • What procedures receiving mail servers take on unauthenticated emails.

The three DMARC p= policies are:

  • p=none - Take no action. Treat the email as if there were no DMARC validation.
  • p=quarantine - Accept the email but send it to a junk/spam folder instead of the inbox or isolate the suspicious message for further inspection.
  • p=reject - Stop delivery of the email to any folder and the sender will be informed why the email is not getting delivered.

If your organization manages to execute a successful DMARC policy, you’ll have an effective way to stop most phishing emails.

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