Simple definition
DMARC tells the recipient servers what to do with emails that claim to come from your domain but fail authentication checks.
Technical definition
Domain-based MessageAccounting, Reporting and Conformance checks the alignment of the visible domain with SPF or DKIM. The policy can be either a nun, a san or a san and include reporting addresses.
What is it used for ?
Observer sending sources, reduce the phishing and protect the reputation of the estate.
Practical example
After a period of analysis in p=none, the company gradually changes to p=quarantine and then p=reject.
Common issues
- passage to a mansman before identifying all sources
- Report address not configured
- Lack of alignment SPF and DKIM
- Percentage of population not well understood
Related terms
Key takeaway: This entry explains the general operation of the term. Exact settings may vary depending on software, vendors and environments.