If I already have a Spam filter (such as McAfee), can I use the SpamBlocker Cox is offering?

Cox’s SpamBlocker solution will significantly enhance your experience with Cox High Speed Internet by reducing spam for all of your Cox.net email accounts. It is compatible with McAfee SpamKiller and adds an extra layer of protection. McAfee SpamKiller allows more options for the customer and their spam blocking needs. In addition, you can use McAfee SpamKiller to block spam on non-cox.net accounts.