Go back to removing previous spam headers if we think it's spam.

states/email/exim4/local_check_data

@@ -19,10 +19,10 @@
   #deny  message    = Message discarded as high-probability spam
   #      condition  = ${if eq{$spam_action}{reject}}
 
-  # This is an additional check to Mythic's rspamd, so don't
-  # remove any spam judgement that has made.
-  # Remove foreign headers
-  #warn remove_header = x-spam-bar : x-spam-score : x-spam-report : x-spam-status
+  # Mythic's rspamd will have refused any RBL failures. Leave the rest
+  # of the spam judgements up to our rspamd. If we think it's spam,
+  # remove previous spam judements.
+  warn remove_header = x-spam-bar : x-spam-score : x-spam-report : x-spam-status
 
   # add spam-score and spam-report header when "add header" action is recommended by rspamd
   warn