To create and manage your primary e-mail account filters, you have to log-in to your cPanel control panel and click on "Global e-mail filters", in the "Email" section.
Then click on "Create new filter".
Here, enter the name for your new filter and set rules on objects, addresses and contents of all the e-mails you wish to block. In addition, you can regulate several different actions such as, for example, redirecting e-mails to another e-mail address or discard messages.
After setting all rules and actions, click on "Create" to end the operation.