Attic M365 FREE vs FirmGuardian Email Protection: Side-by-Side Comparison (2026)

Attic M365 FREE: Protects Microsoft 365 users from phishing attacks using fake login pages. built by Attic Security. Core capabilities include Real-time detection of fake Microsoft 365 login pages, Red alarm screen warning when accessing fraudulent pages, Authenticity seal display on official Microsoft 365 login pages..

FirmGuardian Email Protection: Managed anti-phishing service combining AI detection with human analyst review. built by FirmGuardian. Core capabilities include AI-powered phishing detection and automated quarantine, Human analyst review for low-confidence email classification, Business Email Compromise (BEC) and impersonation protection..

Both serve the Anti-Phishing market but differ in approach, feature depth, and target audience.

Attic M365 FREE differentiates with Real-time detection of fake Microsoft 365 login pages, Red alarm screen warning when accessing fraudulent pages, Authenticity seal display on official Microsoft 365 login pages. FirmGuardian Email Protection differentiates with AI-powered phishing detection and automated quarantine, Human analyst review for low-confidence email classification, Business Email Compromise (BEC) and impersonation protection.

Attic M365 FREE is developed by Attic Security. FirmGuardian Email Protection is developed by FirmGuardian. Vendor maturity, funding stage, and team size can be important factors when evaluating long-term viability and support quality.

Attic M365 FREE integrates with Microsoft 365. FirmGuardian Email Protection integrates with Microsoft 365, Google Workspace, Microsoft Teams. Check integration compatibility with your existing security stack before deciding.

Attic M365 FREE and FirmGuardian Email Protection serve similar Anti-Phishing use cases: both are Anti-Phishing tools. Review the feature comparison above to determine which fits your requirements.