Installing the Plugin on Thunderbird
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In Thunderbird, go to Tools > Add-ons > Extensions.
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Click on the configuration button and select Install Add-On from File....
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Choose the .xpi file that you downloaded from the Fortinet Support site and click Install.
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Restart Thunderbird.
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Now, when you compose a new email, you will see a Secure Send button. To send secure email, you use the Secure Send button instead of the Send button.
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After this email is sent, it will automatically have an “X-Fe-Sensitivity: Confidential” email header. On FortiMail, you can create a content profile to do Content Monitor scan for “X-Fe-Sensitivity: Confidential” in the email header to trigger IBE encryption.