What DMARC Actually Protects You From, and What It Does Not
Summary
DMARC is not a general spam or phishing filter; it verifies that the visible From address aligns with SPF/DKIM results. The article explains SPF, DKIM, DMARC, and alignment modes (relaxed vs. strict), and highlights DMARC's limitations such as lookalike domains, display-name impersonation, and forwarding issues. It also discusses when enforcement like p=reject can be used safely with monitoring.