Attic M365 FREE vs Rspamd: Side-by-Side Comparison (2026)
Features, pricing, ratings, and pros and cons, compared head to head.
Attic M365 FREE is a commercial anti-phishing tool by Attic Security. Rspamd is a free email security platforms tool. Compare features, ratings, integrations, and community reviews side by side to find the best anti-phishing fit for your security stack. Independent and vendor-neutral: our scores and rankings are earned, never bought — sponsored placement is always labeled.
CST VerdictShort 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. Infrastructure teams managing high-volume mail servers should choose Rspamd for its lightweight filtering engine that doesn't degrade throughput the way heavier solutions do. The 2,396 GitHub stars and active open-source community signal solid production stability, and its modular architecture means you integrate exactly what you need into your MTA stack rather than replacing it. Skip this if your organization needs centralized policy management and reporting across multiple mail nodes; Rspamd is a filtering tool, not an enterprise email security platform.
Based on our analysis of core features, integrations, company size fit, deployment model, here is our conclusion:
