Vendor Profile

Tessian

Tessian (now part of Proofpoint following acquisition) is a human layer security platform that uses machine learning to protect against inbound email threats and prevent outbound data loss caused by human error. Its AI engine analyzes email communication patterns to detect phishing, BEC, account takeover, and misdirected emails — where users accidentally send sensitive data to the wrong recipient. Tessian's unique strength is its ability to prevent accidental data loss alongside inbound threat protection, addressing the human risk layer that traditional gateways miss.

Last updated February 28, 2026

Founded

2013

Pricing

Custom pricing / per-user licensing

Verify with vendor

Deployment

Cloud

AI Email Security

Key Features

+Inbound email threat detection

+Misdirected email prevention

+Accidental data loss protection

+Behavioral AI for anomaly detection

+Real-time user coaching notifications

+Account takeover detection

+API-based deployment

+Exfiltration detection for data theft

Pros & Cons

Pros

+Unique misdirected email prevention addresses a gap no other tool covers well
+Behavioral AI catches threats that gateway solutions miss
+Real-time coaching helps users make better security decisions
+Prevents both intentional exfiltration and accidental data loss
+API-based deployment with no MX record changes required

Cons

–Now part of Proofpoint — future as standalone product uncertain
–Not a full email gateway replacement
–Narrower threat coverage than comprehensive email security platforms
–Behavioral models require learning period to reduce initial false positives
–No email archiving or compliance capabilities

Best For

Organizations concerned about both inbound email threats and accidental data loss from misdirected emails and human error

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