Cleanmail by BytePlant

Hey all, looks like I got my mail server functioning thanks to alot of help from forums and good old hunting and pecking.

Now I'd like to add a spam filter to my setup. I'm giving CleanMail a shot, based on web recommendations. I'd like to run it on the same server James is running on, but it is conflicting with my SMTP and POP ports, then shuts down. I know only one program can be listening to a port at a time, but I'm not quite clear on how this whole thing would work.

Does anyone have any experience with CleanMail, particularly in a Linux environment?

Thanks!