Tessian

Tessian focuses on human-layer security — protecting against email-based threats like phishing, data exfiltration, and accidental data loss. The AI analyzes email behavior patterns to identify anomalies: unusual recipients, sensitive attachments going to external addresses, or messages that mimic legitimate senders but have subtle differences. What sets Tessian apart is its focus on preventing accidental threats, not just malicious ones. It flags when you're about to send an email to the wrong John Smith or when you're forwarding an NDA-protected document to a personal email. The system learns individual user behavior and provides just-in-time warnings without blocking emails outright. The challenge is finding the right sensitivity level — too aggressive and users get annoyed, too lenient and threats slip through. Deployment requires user education to be effective.