Spam Assassin is an e-mail filter in cPanel that helps control spam. Using a set of "rules", Spam Assassin will automatically delete unwanted emails from your account or mark them so that you can sort them locally (via the email software used).
To activate Spam Assassin, log in to cPanel, enter the "Mail Manager" menu and click on "Spam Assassin". From there you can choose to enable or disable it and set the options it uses when checking your email.
Attention! This option is only available on Linux servers.