This report highlights how phishing and spoofing campaigns erode trust in government communications. State and local agencies depend on email for tax updates, benefits, licenses, and alerts, yet Gmail and Yahoo now require bulk senders to adopt DMARC or risk message rejection. Noncompliance disrupts vital services, causing missed payments or unreceived emergency alerts. The guide details DMARC’s monitor, quarantine, and reject policies, providing visibility into all sending sources. Large states face challenges aligning hundreds of subdomains, but Proofpoint simplifies deployment through automation, expert support, and monitoring dashboards. The paper underscores that effective DMARC adoption safeguards citizens, prevents fraud, and ensures uninterrupted delivery of essential services.

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