Configuring Thunderbird To Use Your New S/MIME Certificate
Your certificate is installed in Thunderbird. You need to map the certificate to your e-mail account.
- Open Thunderbird
- From the Tools menu, select Account Settings (if you are using Mac OS X select Account Settings from the Edit menu)
- Expand the menu for the account you would like to add security to.
- Select Security from the expanded account menu.
- In the Digital Signing box, click the Select button.
- Choose the imported certificate and click OK.
NOTE 1: If you have had an S/MIME certificate before look for the USERTRUST Network certificate.
NOTE 2: If you have had other USERTRUST Network certificates before choose the one with the highest ID number.
- You will be presented with a dialog box suggesting that you specify a certificate for other people to use when sending you encrypted e-mail messages. Click OK, to use the same certificate.
- Click OK.
- Check the Digitally sign messages (by default) checkbox in the Digital Signing area. This will configure your mail client to digitally sign all outgoing e-mail messages by default.
- Check the Never (do not use encryption) radio button in the Encryption area. this will make encryption optional on outgoing e-mail messages.
- Click OK, to complete the configuration of your account.
Congratulations, your outgoing e-mail will now be digitally signed by default. Test this by sending yourself a message. Now would be a good time to delete the downloaded certificate bundle (.p12 file), if you haven’t already.