Configuring Thunderbird

Sign or encrypt your emails with S/MIME

Start Thunderbird and click on Tools -> Options -> Advanced -> Certificates -> View Certificates -> Import

Goto the account settings and choose the imported certificate under security.

When you create a new message, you have the option to sign and encrypt the message.

A signed message is marked with a certificate icon in Thunderbird.

An encrypted message is marked with a padlock icon in Thunderbird.