[Rspamd] Remove MX check overrides that rspamd ignores

data/conf/rspamd/local.d/composites.conf

@@ -1,7 +1,3 @@
-MX_IMPLICIT {
-  expression = "MX_GOOD & MX_MISSING";
-  score = -0.01;
-}
 VIRUS_FOUND {
   expression = "CLAM_VIRUS & !MAILCOW_WHITE";
   score = 2000.0;

data/conf/rspamd/local.d/groups.conf

@@ -23,24 +23,6 @@ symbols {
   }
 }
 
-group "MX" {
-  "MX_INVALID" {
-    score = 0.5;
-    description = "No connectable MX";
-    one_shot = true;
-  }
-  "MX_MISSING" {
-    score = 2.0;
-    description = "No MX record";
-    one_shot = true;
-  }
-  "MX_GOOD" {
-    score = -0.01;
-    description = "MX was ok";
-    one_shot = true;
-  }
-}
-
 group "reputation" {
   symbols = {
     "IP_REPUTATION_HAM" {

data/conf/rspamd/local.d/mx_check.conf

@@ -1,6 +1,5 @@
 timeout = 8.0;
 symbol_bad_mx = "MX_INVALID";
-symbol_no_mx = "MX_MISSING";
 symbol_good_mx = "MX_GOOD";
 expire = 86400;
 key_prefix = "rmx";