DMARC
Domain-based Message Authentication, Reporting, and Conformance, an email policy signal built on SPF and DKIM alignment.
Why it matters
DMARC helps domains guide receivers on how to handle unauthenticated mail.
Example pattern
Authentication-Results includes dmarc=fail for a message claiming to be from a brand.
How CheckLink can help
CheckLink can show DMARC results found in pasted headers as one context signal.
Related terms
Related guides
Check the signal in context
Security terms are useful, but real decisions need context. Use CheckLink to inspect available signals before you click.