How to Configure Thunderbird to Use Your Smart Card for Signing and
In this procedure, you configure Thunderbird to encrypt and sign
emails with the certificate from your smart card.
Before You Begin
You have completed How to Download Smart Card Certificates for Web and Email Use.
Download the certificates for this application only.
Insert your CAC smart card.
The green light should flash.
Add the CAC module to Thunderbird as a security device.
From the Thunderbird Preferences Menu, navigate to the
Advanced Section, Certificates tab, click the Security Devices
button, then the Load button.
Type "CAC Module" as the module name and browse to the
appropriate CAC module.
For CACKey, select
For Coolkey, select
Thunderbird can now read the client certificates from your CAC
In Thunderbird, test your configuration by sending an email to
When composing the email message, pull down the Security
menu and choose "S/MIME Sign" and "S/MIME Encrypt" before sending