DMARC
explained.
What is
DMARC?
DMARC tells receiving mail servers what to do with emails that fail SPF or DKIM checks. It also provides reporting on email authentication.
Why it
matters.
DMARC is the final layer of email security. It enforces SPF and DKIM policies and provides visibility into email authentication failures. Essential for protecting your business from email-based attacks.
What can
go wrong.
If DMARC is missing: you have no control over what happens to spoofed emails, no visibility into authentication failures, and cannot achieve complete email security.
Technical
details.
DMARC policies: "none" (monitor only), "quarantine" (send to spam), "reject" (reject email). Should include "pct=100" (apply to 100% of emails) and "rua=" (reporting email address).
Check your domain’s
DMARC policy.
Run a free security check to see how your domain scores across all sixteen checks, including DMARC validation.