In 2026, the "best" hosted spam filter depends heavily on your scale, but and Abnormal AI are frequently cited as top-tier solutions for their high detection accuracy and forward-thinking security models. Top-Rated Hosted Filters by Use Case
SpamTitan and Hornetsecurity are popular for their ease of use, competitive pricing, and multi-tenant capabilities for managed service providers.
Microsoft Defender for Office 365 and Google Workspace provide robust, native protection that many organizations find sufficient as a baseline before adding a dedicated third-party layer. A Success Story: Eradicating the "Deluge"
