What is DMARC?
How DMARC connects SPF and DKIM to protect your domain.
Start with the basics
DMARC tells receiving systems how to handle messages that fail aligned SPF and DKIM checks.
What to check
Start with p=none to collect reports, review legitimate sources, then move carefully to quarantine and reject.
A safe next step
Use a reporting address you control and do not skip the monitoring phase for an established domain.