This would show the top suspicious user accounts from where suspicious mail activities are happening. Organizations can better watch over such mail accounts, which can be blocked, so no such activities will happen in the future from those accounts. The report can show all such events and will give detailed insight on such events, and we can alter the rules to enhance the security.
Administrator creates a lot of rules on a need basis and forgets to remove them if not required. After a certain period of time, we will have a huge set of rules in the firewall that may not even be executing for a long period of time. This report would help to find such rules that can be removed from the system and can help the administrator manage the system more efficiently.