New Install - Tons of Spam Getting Through

[Jerry Malcolm]

I installed the latest SpamAssassin In a Box yesterday (Win Server 2008 
r2).  I kept all of the defaults.  It is up and running.  But I'm 
getting a huge amount of spam, and I mean 'obvious' spam mentioning body 
parts in the subject line.... that are getting low scores (averaging 
about 15 uncaught spams per hour per user inbox).  It's still catching 
some spam.  So I assume it just a scoring issue.

I tried running sa-update.  It said no updates were available. I'm 
fairly certain that SA is better at recognizing spam that it is 
currently doing on my system.  Is there something else I need to do in 
order to get it to begin recognizing obvious spam? Hopefully 15 uncaught 
spams per hour is not considered the acceptable norm.

Thanks.

Jerry