How to sign/encrypt email using OS X Mail and a secure certificate authority CA

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A video walking through how to set up secure certifications using a Certificate Authority (CA). This allows you to sign email for authentication and also encrypt email to someone using their public key. This example is using Mac OS X Mail app, but the setup is similar for other applications. Also for this example I'm using the free Comodo service for the CA, but a number of other options are available. Once configured, the exported certificate can then be installed on other computers/devices. Comodo Free Email Certificate: https://www.comodo.com/home/email-security/free-email-certificate.php