I'm having the same problem. Lots of gibrish spam with quite a high score:
X-Spam-Flag: YES
X-Spam-Level: ***************
X-Spam-Status: Yes, score=15.7 required=4.6 tests=BAYES_99,FROM_12LTRDOM,
FSL_HELO_BARE_IP_1,FSL_HELO_BARE_IP_2,MISSING_MID,RCVD_IN_BRBL_LASTEXT...