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DMARC
Security
Domain-based Message Authentication, Reporting & Conformance: policy + alignment enforcing SPF/DKIM results and reporting.
Definition
DMARC requires alignment between the visible From domain and authenticated SPF/DKIM results. It lets domains publish policies (none/quarantine/reject) and receive reports to monitor abuse.
In plain English
Domain-based Message Authentication, Reporting & Conformance: policy + alignment enforcing SPF/DKIM results and reporting.
Why this matters
Why it matters: Strong DMARC reduces domain spoofing and improves trust.
Example
Example: Start with monitoring (p=none), fix legitimate senders, then move to quarantine/reject and review reports.