Tessian

Tessian uses behavioral AI to protect enterprise email from data loss, phishing, and misaddressed sends before they cause incidents.

Overview

Tessian, now part of Proofpoint, applies machine learning to email behavior, preventing data loss from misdirected emails, stopping advanced phishing, and detecting account takeovers. Its Human Layer Security approach builds per-employee behavior models to catch mistakes and threats in real time — like attaching the wrong file or emailing a confidential document externally. Security awareness coaching is woven into the flow, nudging employees at the moment of risk. Enterprises adopt Tessian to address the human-error causes of breaches that traditional controls cannot see.

Tessian addresses the security incidents that firewalls cannot see: the well-meaning employee who emails the wrong attachment, the finance staffer who wires to a changed account, the executive whose mailbox quietly gets taken over. Behavioral models per employee catch these deviations at the moment of risk, with just-in-time nudges that educate rather than block. Data-loss prevention becomes practical where rule-based DLP drowns in exceptions — because the rule is simply how this person normally behaves. Reporting quantifies human-layer risk for compliance and board conversations. As part of Proofpoint, Tessian now integrates into a broader email-security portfolio. For organizations whose breach history is dominated by human error, it treats the actual root cause rather than adding another gate.

Key Features

• Behavioral AI preventing misaddressed emails and data loss
• Advanced phishing and impersonation detection in real time
• Account takeover detection based on anomalous email behavior
• Just-in-time security coaching that nudges users at risk moments
• Integration with Microsoft 365 and Google Workspace email
• Reporting on human-layer risk for security and compliance teams

Pricing

Tessian is sold through enterprise subscriptions priced by mailbox count and modules, delivered with Proofpoint’s sales and support ecosystem. Deployments are cloud-based with fast onboarding and measurable risk reduction reporting.

Who Is It For

It is built for enterprises where human error and social engineering are top breach causes — legal, finance, healthcare, and professional services. Security teams use it to reduce insider-risk incidents without heavy user friction.

FAQ

Is Tessian free to use?

No. Tessian is an enterprise platform sold through subscription contracts sized to mailbox volume and modules. Buyers evaluate it against their incident history, particularly data-loss and phishing events.

Does Tessian offer an API?

Yes. Tessian integrates with email platforms and security ecosystems, exposing events and reporting to SIEM and SOAR tools for broader security workflow automation.

How does Tessian compare to alternatives?

Compared with secure email gateways, Tessian focuses on behavioral prevention of human-error incidents like misdirected email. Versus native platform controls, its per-employee behavior models catch risks that rule-based DLP misses.