Index: rules/50_scores.cf
===================================================================
--- rules/50_scores.cf	(revision 226280)
+++ rules/50_scores.cf	(working copy)
@@ -51,15 +51,6 @@
 score BANG_MORE 0.287 0.0001 0.294 0.0001
 score BANG_OPRAH 0.666 0.212 1.717 1.975
 score BARGAIN_URL 1.503 1.520 1.686 1.833
-score BAYES_00 0.0001 0.0001 -1.665 -2.599
-score BAYES_05 0.0001 0.0001 -0.925 -0.413
-score BAYES_20 0.0001 0.0001 -0.730 -1.951
-score BAYES_40 0.0001 0.0001 -0.276 -1.096
-score BAYES_50 0.0001 0.0001 1.567 0.001
-score BAYES_60 0.0001 0.0001 3.515 0.372
-score BAYES_80 0.0001 0.0001 3.608 2.087
-score BAYES_95 0.0001 0.0001 3.514 2.063
-score BAYES_99 0.0001 0.0001 4.070 1.886
 score BEST_PORN 0.566 0.263 0.044 0.0001
 score BE_BOSS 1.512 0.145 1.847 1.648
 score BILLION_DOLLARS 0.193 1.185 0.407 0.134
@@ -564,6 +555,17 @@
 score HIGH_CODEPAGE_URI 2.5
 score MISSING_HB_SEP 2.5
 
+# make the Bayes scores unmutable (as discussed in bug 4505)
+score BAYES_00 0.0001 0.0001 -2.312 -2.599
+score BAYES_05 0.0001 0.0001 -1.110 -1.110
+score BAYES_20 0.0001 0.0001 -0.740 -0.740
+score BAYES_40 0.0001 0.0001 -0.185 -0.185
+score BAYES_50 0.0001 0.0001 0.001 0.001
+score BAYES_60 0.0001 0.0001 1.0 1.0
+score BAYES_80 0.0001 0.0001 2.0 2.0
+score BAYES_95 0.0001 0.0001 3.0 3.0
+score BAYES_99 0.0001 0.0001 3.5 3.5
+
 # HTML control test
 score HTML_MESSAGE 0.001