Tessian

Human layer security platform preventing inbound threats and outbound misdirected emails

ToolAI Email SecurityCloud

Pricing: Custom pricing / per-user licensing

Reviewed by the CyberSecTool editorial team against the public sources cited below · Last reviewed February 2026 · How we review listings

What is 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.

Best for: Organizations concerned about both inbound email threats and accidental data loss from misdirected emails and human error
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
Considerations
  • • 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

Reported in public reviews and vendor documentation. See sources below.

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

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Tessian Comparisons

Tessian vs Proofpoint→Tessian vs Abnormal Security→Tessian vs Barracuda Email Security→Tessian vs Microsoft Defender for Office 365→Tessian vs Mimecast→Tessian vs IRONSCALES→Tessian vs Cisco Secure Email→Tessian vs Trend Micro Email Security→

Sources & references

Where the information on this listing comes from. Always verify pricing and capabilities against the vendor before a purchasing decision.

Tessian — official websitePrimary source
Tessian is Now Proofpoint (official redirect target)
Official site (Proofpoint)
Proofpoint Closes Acquisition of Tessian
Official press release
Email security startup Tessian raises $13M led by Balderton and Accel
TechCrunch

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Quick Info
PricingCustom pricing / per-user licensing
ModelPer-user subscription
Founded2013
CloudYes
Self-HostedNo
Visit Website →

Last updated: Feb 20, 2026

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In the glossary
Email Security