I installed spamassassin site-wide, after getting Razor2, pyzor and DCC working. 
I noticed that DCC and Razor seemed to be called, but not Pyzor.

I tracked this down to my use of spamc. In fact, do the following to see this 
bug. Is there a fix?

bash$ spamassassin < /usr/doc/spamassassin-2.55/sample-spam.txt >&  FOO

bash$ spamc < /usr/doc/spamassassin-2.55/sample-spam.txt >&  FOO2

bash$ diff -u FOO2 FOO
--- FOO2	Sun Jun 29 21:21:08 2003
+++ FOO	Sun Jun 29 21:20:54 2003
@@ -25,14 +25,14 @@
 Message-ID: <N1msdrbJXNPfV4wg9>
 To: undisclosed-recipients: ;
 Sender: dev_null_sample_spam@example.com
-X-Spam-Status: Yes, hits=19.1 required=5.0
+X-Spam-Status: Yes, hits=20.3 required=5.0
 	tests=BAYES_80,DCC_CHECK,DRASTIC_REDUCED,FROM_HAS_MIXED_NUMS,
 	      HOME_EMPLOYMENT,INVALID_DATE,INVALID_MSGID,NO_REAL_NAME,
-	      ONCE_IN_LIFETIME,RAZOR2_CF_RANGE_91_100,RAZOR2_CHECK,
-	      RCVD_IN_NJABL,RCVD_IN_OSIRUSOFT_COM,REMOVE_SUBJ,
-	      SMTPD_IN_RCVD,X_NJABL_OPEN_PROXY
+	      ONCE_IN_LIFETIME,PYZOR_CHECK,RAZOR2_CF_RANGE_91_100,
+	      RAZOR2_CHECK,RCVD_IN_NJABL,RCVD_IN_OSIRUSOFT_COM,
+	      REMOVE_SUBJ,SMTPD_IN_RCVD,X_NJABL_OPEN_PROXY
 	version=2.55
-X-Spam-Level: *******************
+X-Spam-Level: ********************
 X-Spam-Checker-Version: SpamAssassin 2.55 (1.174.2.19-2003-05-19-exp)
 X-Spam-Report:   This mail is probably spam.  The original message has been 
attached
   along with this report, so you can recognize or block similar unwanted
@@ -41,7 +41,7 @@
   2000 MILLIONAIRE, AUGUST 2000 TYCOONS AND AUGUST 2000 ENTREPRENEUR
   Magazine. ====> Do you have a burning desire to change the quality of
   your existing life? [...] 
-  Content analysis details:   (19.10 points, 5 required)
+  Content analysis details:   (20.30 points, 5 required)
   NO_REAL_NAME       (1.1 points)  From: does not include a real name
   SMTPD_IN_RCVD      (0.6 points)  Received via SMTPD32 server (SMTPD32-n.n)
   INVALID_DATE       (0.6 points)  Invalid Date: header (not RFC 2822)
@@ -56,6 +56,7 @@
   [cf:  96]
   RAZOR2_CHECK       (0.9 points)  Listed in Razor2, see http://razor.sf.net/
   DCC_CHECK          (2.6 points)  Listed in DCC, see http://rhyolite.
com/anti-spam/dcc/
+  PYZOR_CHECK        (1.2 points)  Listed in Pyzor, see http://pyzor.sf.net/
   RCVD_IN_NJABL      (0.8 points)  RBL: Received via a relay in dnsbl.njabl.org
   [RBL check: found 254.105.28.200.dnsbl.njabl.org.]
   X_NJABL_OPEN_PROXY (0.8 points)  RBL: NJABL: sender is 
proxy/relay/formmail/spam-source