Microsoft Defender for Office 365 vs MX Layer Outbound Email Filtering: side-by-side comparison (2026)

Microsoft Defender for Office 365: Email and collaboration security for Microsoft 365 environments. Built by Microsoft.

MX Layer Outbound Email Filtering: Outbound email filtering platform for spam prevention and IP reputation mgmt. Built by MX Layer.

The table above shows where their features, integrations, deployment and company size fit differ.

Microsoft Defender for Office 365 is made by Microsoft. MX Layer Outbound Email Filtering is made by MX Layer. The vendor behind a product decides its roadmap, support, and longevity, so check each company's profile before you commit.

Often, yes. Microsoft Defender for Office 365 and MX Layer Outbound Email Filtering are both Email Security Platforms products. Use the table above to see where features, deployment and company size fit differ.