TBS Internet is offering a free email signing certificate valid for one year.
Go to https://www.tbs-internet.com/php/HTML/commande.php?p=2&id=106 and fill the form; after 3 different emails to confirm your request and validate it, your certificate will be available to install.
A pop up window may appear when you reach the web site to inform you that the site will perform action on your behalf; that’s ok.
Enjoy email signing 