[Mimedefang] mimedefang letting some spams through...why?

[Tony]

> Your question is meaningless until we see your filter.  MIMEDefang
> itself is just a framework for mail filtering.  It's up to you to
> write the filtering rules.

ok thank for your response. My filter is here:
http://www.zen187664.zen.co.uk/spam/mimedefang-filter-rejecting.txt
in it I can't see why mimedefang lets some spams though. The bit that I 
edited was at the end titled:
If SpamAssassin found SPAM...