a) Login to your website CPanel
b) Under Mail section click on Spam Assassin
c) Now on this interface as highlighted select “Enable Spam Assassin.” Once you have clicked this button, you will get a confirmation page
d) Here You can confirm that Spam Assassin is enabled by going back to the Spam Assassin page.
e) Now on this interface set the strength. The recommended value for the strength is 5