Many services on the server may send warnings and informational messages. cPanel itself sends notifications regarding update runs, services being restarted, accounts being created or terminated, and backup runs.
Instead of trying to delete the messages, it is better to forward them to an address you check regularly, so that you can review them. There is a very good chance that some of the messages will contain important information, and ignoring them may cause you to miss a problem that will escalate into a more serious problem.
You can easily set the forwarding preferences in the WebHost Manager, in
Main >> Server Contacts >> Change System Mail Preferences.
The following section of our documentation explains these forwarding options:
Change System Mail Preferences
I strongly recommend setting a forwarding preference, instead of disregarding the messages or trying to make a change to try to prevent them from being sent.