http://4gmrlefxkq4mtan6a2lqwfwa7un4brjlatka75nwdczemqqwn3wznnad.onion/en/Products/email-certificate
Mozilla Thunderbird, Microsoft Outlook, Mail.app) in order to digitally sign or encrypt emails, using the S/MIME standard. What is it used for ? Recipients of your emails can securely validate whether a message originated from your real email address or not, and also verify if it has been altered in any way .