Email security is not only about blocking threats. It is about choosing the right protection level, for the right users, without creating bypasses that weaken the tenant. This interactive policy builder helps Microsoft 365 admins, Exchange Online admins and security teams design practical Defender for Office 365 and EOP policies. Includes a 7-input protection scoring engine, Standard vs Strict vs Custom decision framework, persona-based baselines, anti-phishing and impersonation protection, Safe Links, Safe Attachments, quarantine workflow, Tenant Allow/Block List guidance, mail flow alignment, rollout phases, and 18 common mistakes from real tenants.

Microsoft Defender for Office 365 Plan 1 is being added to Office 365 E3 and Microsoft 365 E3 with the July 2026 update. This article explains what you actually get, what still belongs to Plan 2, and the key settings to configure so the licence becomes real protection.