dont want to install mailscanner,which would let me filter spam above a certain "high spam" score. I'd like to add such a filter to the domain level cpanel.

Can anyone step me through the steps to add a filter that will filter on spam score header entry for say scores 10 and above? I am setting the spam score to 5 which has been working fairly well for me but I want to discard the high scores and let the low scores through for local filtering so I dont miss any legitimate mails.