Check the header of an email
X-Spam-Status: No, score=0.1 X-Spam-Score: 1 X-Spam-Bar: / X-Ham-Report: Spam detection software, running on the system "server.domain.com", has identified this incoming email as possible spam. The original message has been attached to this so you can view it (if it isn't spam) or label similar future email. If you have any questions, see root\@localhost for details.
You can also add Barracuda RBL to Exim in WHM
For cPanel /home/username/.spamassassin/user_prefs as described:
Improving SpamAssassin accuracy on cPanel (or any other) mail servers – with statistics