Tessian Defender

Prevent advanced impersonation spear phishing attacks.

How Tessian Defender works

Defender’s stateful machine learning retroactively analyzes historical enterprise email data in order to understand the difference between safe and unsafe emails being received. By analyzing myriad data points within email headers, body text and attachment data, Defender can detect and prevent threats in real time with minimal disruption to employees or administrators.

Why world-leading enterprises invest in Defender

Mitigate risks

Organizations minimize the costs of regulatory sanctions, financial penalties and reputational damage by eliminating the threat of advanced spear phishing.

No more rules

Because Tessian’s machine learning evolves and refines over time, system administrators don’t need to invest time configuring and reconfiguring complex lists of simplistic rules and managing reams of training data.

Simple reporting

Administrators can interrogate full audit logs of activity flagged by Defender. Customers can access insights on Tessian’s intuitive dashboard, which gives admins detailed insights into past and present email security threats in real time.

Seamless deployment

Integration and deployment can be completed in minutes, without the need for any pre-labelled training data or configuration. Defender is able to actively prevent data breaches 24 hours after installation.

Build trust

With Defender, employees know which emails are genuine and which are dangerous. Organizations benefit from more confidence and trust, without needing to invest in costly legacy technologies or distracting training workshops.

Intelligent notifications

Threats trigger real-time warning notifications within the email client. Tessian explains the reasons behind the alert to the employee in the moment, increasing awareness and educating the workforce without impeding regular workflows.

Defender secures all enterprise email environments

Microsoft Office 365


Direct Outlook add-in


Gateway deployment

Microsoft Exchange


Direct Outlook add-in


Gateway deployment

Google G-Suite

Desktop and Mobile

Gateway deployment