Try RMail PRE-Crime Services – The Access Authentication setting provides an extra layer of security by allowing you to require a password or code for recipients to access the signature request and/or the signed document. This ensures that only authorized individuals can view sensitive information, offering enhanced protection for important transactions.
When creating a signature request, you can select the security level in the Access Authentication setting on the left panel, provided you have enabled it by setting it to Active in the Settings. This allows the option to appear during the request creation process. If you haven't set it to Active, you can still select the security level directly in the settings prior to creating the signature request.
Read this article to learn about the Access Authentication setting and how to configure it effectively.
You might also be interested in the Re-verify each signer before document submit setting, which adds an extra layer of security to the signature signing process.