Spam not getting scored ....or something

[maillist <ma...@emailacs.com>]

slackware 11.0
spamassassin version 3.2.3
  running on Perl version 5.8.8
mimedefang 2.63
sendmail 8.14.0

My issue is that it appears that spam is getting through without being 
scanned.  I get a spam message, then run spamassassin -t < message and 
it scores high enough to get marked as spam.  I don't know if it's some 
problem with the milter between sendmail and mimedefang, like a timeout 
or something, or what.

I don't think I get more than 30 messages per minute at peak times, so 
this seems that this wouldn't be the case.  Is anyone else having this 
same issue?

Any help is appreciated
-Aubrey