What are “S/MIME” Certificates ?
Digital certificates for signing and encrypting email messages. These certificates are used by mail client (e.g. 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. If you want to ensure confidentiality of an email and protect against eavesdropping or email theft, then you can encrypt an email using the S/MIME certificate of one or more recipients of the message. Only these recipients will be able to decrypt and read your message.
What are my options ?
For personal or sole proprietorship business
For enterprises or organizations