RMail Side Note Feature can be used by sender by following the simple steps.
Step 1: Compose an email, press the Send Registered button. If there is address in the ‘cc’ and/or ‘bcc’ field, the Side Note text box will activate.
Step 2: The sender may use the SideNote® feature in conjunction with any of the RMail features. In this case, it’s a document sent for signature.
Step 3: On the feature pop-up, simply select the ‘Cc’ and/or ‘Bcc’ checkbox and added note that will be visible only to those recipients, not to the recipients in the ‘To’ field.