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"
“Abnormal also plugs into 365 really well and is easy to use, but what got us to select them is that they are more forward thinking.” Reddit · r/sysadmin · 1 year ago
“Proofpoint is probably the best on security but is very bloated, cumbersome, and takes a lot more time to administer.” Reddit · r/sysadmin · 1 year ago best hosted spam filter
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
Abnormal AI is praised for its behavioral modeling that focuses on what "normal" looks like to catch sophisticated social engineering that traditional list-based filters might miss. Microsoft Defender for Office 365 and Google Workspace
SpamTitan and Hornetsecurity are popular for their ease of use, competitive pricing, and multi-tenant capabilities for managed service providers.
“Mimecast plugs into 365 really well and we liked it's ease of use. It did not seem to be as good as the other 2 on security.” Reddit · r/sysadmin · 1 year ago SpamTitan and Hornetsecurity are popular for their ease
Proofpoint remains a leader for its 99.999% accuracy and specialized protection for high-value targets, though it is often noted for its administrative complexity.