Microsoft Defender for Office 365 vs SmarterTools SmarterMail: side-by-side comparison (2026)

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

SmarterTools SmarterMail: Email server with antispam, antivirus, and security features for Linux/Windows. Built by SmarterTools.

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

Microsoft Defender for Office 365 is made by Microsoft. SmarterTools SmarterMail is made by SmarterTools. 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 SmarterTools SmarterMail are both Email Security Platforms products. Use the table above to see where features, deployment and company size fit differ.