For our cPanel premium hosting accounts we provide SpamAssassin free of charge.
SpamAssassin is a robust scoring framework and set of statistical analysis tests on email headers and body text including text analysis, Bayesian filtering, DNS blocklists, and collaborative filtering databases to screen your incoming emails. For more information visit the following link Apache SpamAssassin?
You can access and amend the default settings to your incoming email filtering by selecting "Spam Filters" within the "Email" section of cPanel.