Sublime Security
Agentic email security with open detection rules and AI that writes new coverage in hours.
Proof of life. Raised $150M Series C led by Georgian, October 2025
About Sublime Security
Sublime sits on Microsoft 365 and Google Workspace via API and lets detection engineers inspect, fork, and publish rules instead of trusting a black box.
Two agents now do the parts vendors used to sit on: one triages inbound mail, the other authors new detections when a novel lure shows up.
The bet is that email defense has to ship like a detection shop, not a quarterly content pack.
Investors
GeorgianIndex VenturesIVPCiti Ventures
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