[Rspamd] Reduce Sorbs recent score

[Rspamd] Add annoying CSA to bulk symbols and score then with 3.2
[Rspamd] Update to 2.4

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

@@ -9,6 +9,9 @@ symbols {
   "BAD_REP_POLICIES" {
     score = 2.5;
   }
+  "BULK_HEADERS" {
+    score = 3.2;
+  }
 }
 
 group "MX" {

data/conf/rspamd/local.d/multimap.conf

@@ -25,6 +25,14 @@ WHITELISTED_FWD_HOST {
   symbols_set = ["WHITELISTED_FWD_HOST"];
 }
 
+BULK_HEADER {
+  type = "content";
+  map = "$LOCAL_CONFDIR/custom/bulk_header.map";
+  filter = "headers"
+  regexp = true;
+  symbols_set = ["BULK_HEADER"];
+}
+
 LOCAL_BL_ASN {
   require_symbols = "!MAILCOW_WHITE";
   type = "asn";

data/conf/rspamd/local.d/rbl_group.conf

@@ -26,7 +26,7 @@ symbols = {
     description = "List of Open SMTP relay servers."; 
   } 
   "RBL_SORBS_RECENT" {  
-    score = 3.5;  
+    score = 2.0;  
     description = "List of hosts that have been noted as sending spam/UCE/UBE to the admins of SORBS within the last 28 days (includes new.spam.dnsbl.sorbs.net)."; 
   } 
   "RBL_SORBS_WEB" {