Are all cf files used in spamassassin

I am a novice with spamassassin. I am having a problem getting my arms around several concepts. Here are several questions.

In looking at the local.cf, I see that the threshhold for marking a piece of mail as spam is 5. Can I have this mail deleted instead of being sent to the user?

In the /usr/share/spamassassin directory there are a number of cf files. Does spamassassin use all these files as tests as a default setting? If not, how do I make sure they are used?

Richmond H. Dyes
Monroe Community Hospital
IS Department Head
760-6213 Received on Thu Oct 11 13:08:05 2007