SpamAssasin not working

I’ve logged into webmail and selected ‘Options > SpamAssassin Configuration’. I’ve set tag to 1, 0 and also to -1 while quarantined to 5. I don’t think these settings make a difference as I don’t see any tags in the new incoming e-mail subject lines, no spamassasin level headers in the e-mails, and nothing is in my junk mail folder. Any ideas? Thanks