If you just purchased your Symantec Digital ID for Secure Email and seeing "Persona Not Validated" in your digital certificate, you may ignore this according from Symantec.
Here's what they told me.
I successfully installed the Digital ID for Secure Email, but I'm seeing this "Persona Not Validated". How to validate this using my email address as email@example.com. Please let me know.
Thank you for choosing a Digital ID from Symantec designed to provide the best S/MIME email security for encrypting and digitally signing documents online.
Symantec has recently made a change to the Digital ID for Secure Email certificates due to security best practices. Going forward, we are placing "Persona Not Validated" in the Common Name field of these certificates. While this change has no impact to major email applications (e.g. Microsoft Outlook, Mozilla Thunderbird, etc.), you may experience issues with applications that want to use these certificates as part of a log-in process if the Common Name is used as authenticating value.
Symantec Customer Support firstname.lastname@example.org