Roundcube is an email client only - it does not have a spam removal or recognition component. However, your Cpanel includes and option called Spam Assassin. There's also the option of using Box trapper which will require that a user identify themselves before delivering email to you. Here's an article that leads information on how to use either option:
Reducing Email Spam
If you have any further questions, please contact technical support or leave a comment at the bottom of the page.
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