PDFAITools
Tessian
AI-powered email security platform that prevents phishing, data loss, and insider threats by understanding human behavior.
What is Tessian?
AI Email Security That Understands Human Behavior
Tessian is an AI-powered email security platform that protects organizations from phishing attacks, accidental data loss, and insider threats by understanding the human behavioral patterns behind email communication. Unlike rule-based email security tools, Tessian's machine learning models learn how each individual employee normally communicates — and detect anomalies that indicate a threat or mistake.
Behavioral AI for Email Protection
Tessian analyzes historical email communication patterns for every user in an organization to build behavioral baselines. When an employee receives a phishing email impersonating a trusted contact, or is about to send sensitive data to the wrong recipient, Tessian's AI detects the behavioral anomaly and intervenes — warning the user or blocking the action. This approach catches sophisticated social engineering attacks that bypass traditional email gateways.
- Inbound phishing and BEC detection via behavioral AI
- Outbound data loss prevention — catches misdirected emails
- Insider threat detection via anomalous sending behavior
- In-the-moment user warnings rather than blanket blocks
Key Features
Learns each employee's email patterns to detect anomalies at the individual level.
Detects sophisticated spear phishing and BEC attacks that evade gateway filters.
Catches misdirected emails and accidental sensitive data sharing before sending.
Identifies abnormal email exfiltration behavior indicating insider threats.
Warns users in-context rather than silently blocking — educates while protecting.
Who Uses Tessian?
Catch targeted spear phishing and CEO fraud that traditional tools miss.
Prevent sensitive data from being sent to wrong recipients through AI detection.
Demonstrate email data protection controls for regulatory compliance requirements.
Detect employees exfiltrating data via email before leaving the organization.
Pros & Cons
✅ Pros
- Behavioral approach catches social engineering attacks that bypass signature tools
- Outbound DLP for misdirected emails solves a frequently underestimated risk
- User warnings educate employees rather than just silently blocking
- No rule configuration — AI learns from existing email patterns automatically
❌ Cons
- Enterprise pricing — not accessible to SMBs
- Requires access to historical email data to build behavioral baselines
- Initial learning period before protection is fully calibrated
- User warning fatigue is possible if sensitivity tuning is not done carefully
Tessian Pricing
Human Layer Security
- Inbound phishing detection
- Behavioral AI
- User warnings
- Standard support
Enterprise
- Full platform
- Outbound DLP
- Insider threat
- Advanced analytics
- Dedicated support
Tessian earns a 4.9/5 rating from our editorial team. While it requires a paid subscription, the professional-grade capabilities deliver strong ROI for serious users. Standout strengths include behavioral approach catches social engineering attacks that bypass signature tools and outbound dlp for misdirected emails solves a frequently underestimated risk.
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