This white paper argues that Microsoft 365’s native email protections, including Exchange Online Protection and Defender for Office 365, should not be treated as a complete security perimeter. FirstWave cites real-world deployments where a second security layer detected business email compromise, malicious attachments, delayed phishing links, credential harvesting, QR threats, and other messages Microsoft had classified as safe or low-confidence. The paper advocates layered email defence using CyberCision, which adds Cisco Talos threat intelligence, sandboxing, URL rewriting and analysis, SPF/DKIM/DMARC controls, anti-spoofing, and deeper policy enforcement. It also emphasizes support for government and regulated organizations seeking alignment with the ASD Essential Eight, ISM, ISO 27001,

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