[Fix] Adjust MISSING_MIMEOLE score

conf/metrics.conf

@@ -80,7 +80,7 @@ metric {
             description = "Quoted reply-to from yahoo (seems to be forged)";
         }
         symbol "MISSING_MIMEOLE" {
-            weight = 5.0;
+            weight = 2.0;
             description = "Mime-OLE is needed but absent (e.g. fake Outlook or fake Exchange)";
         }
         symbol "MISSING_TO" {