The Notifications History screen is where Kuali system notifications are tracked for audit purposes. These are the system generated notifications configured in the Notifications maintenance table. For example, Person Certification, Proposal Created, All Proposal Person Certifications Completed, etc.
Each system triggered notification will get a separate row with Date Created, Recipients, Subject, and Message content. Again, these are only system generated notifications and not workflow Approval/FYI/Acknowledge requests emails; the audit of those can be previewed in the Route Log.