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    Tessian (Human Layer Security with Encryption)

    Tessian was a human-layer email security vendor that used machine learning to stop data loss, BEC, phishing, and accidental disclosure in email workflows.

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    Encryption & Key ManagementEmail SecurityDLPHuman Error PreventionData Encryption

    Tessian protected Microsoft 365 email traffic by using machine learning to block accidental disclosure, BEC, and phishing at the point of send or receive. Its main value in this category was policy enforcement and user coaching around email-driven data loss, not standalone key management.

    • Enterprises using Microsoft 365 that require policy-based email protection with DLP capabilities and user coaching to mitigate human-centric email security risks.
    • Preventing accidental data loss via email
    • Stopping sophisticated phishing and BEC attacks
    • Mitigating insider threats through email analysis
    • Enhancing employee security awareness through real-time nudges
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    Profile last updated on 6 September 2026 by Picari.