Attic M365 FREE vs Spoofcheck: Side-by-Side Comparison (2026)

Short answer

Startup and SMB security teams protecting Microsoft 365 will benefit most from Attic M365 FREE because it stops AiTM phishing attacks that bypass MFA, the attack class traditional email filters miss entirely. The tool deploys in five minutes with no payment required, making it immediately useful for resource-constrained teams, and its real-time detection of fake login pages covers both NIST PR.AA and DE.CM functions simultaneously. Skip this if your organization needs protection beyond Microsoft 365 or runs a heterogeneous SaaS stack; Attic is deliberately focused on one platform and one threat vector. Security teams that need fast visibility into domain authentication gaps should start with Spoofcheck; it audits SPF, DKIM, and DMARC configurations in seconds without requiring vendor setup or credentials. The tool runs as a lightweight command-line script with 33 GitHub stars from practitioners who rely on it for quick diagnostics before and after phishing incidents. Skip this if you need continuous monitoring or automated remediation; Spoofcheck is a one-time scanner, not a managed service.