What does a delivery failure notification indicate?

A delivery failure notification indicates that the email notification intended for the recipient did not successfully reach its destination. This could be due to various reasons, such as an incorrect email address, the recipient's inbox being full, or other technical issues that prevented the message from being delivered.

Understanding this concept is crucial for ensuring that all parties involved in the document signing process are notified and can take the necessary steps to resolve any issues, such as resending the document or verifying the recipient's email address. The other options relate to the status of the document itself or the actions of the recipient, which do not pertain to the failure of email delivery.