[Rspamd] Set rspamd as trusted host, rspamd is not spoofing

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

@@ -90,6 +90,12 @@ SIEVE_HOST {
   symbols_set = ["SIEVE_HOST"];
 }
 
+RSPAMD_HOST {
+  type = "ip";
+  map = "$LOCAL_CONFDIR/custom/rspamd_trusted.map";
+  symbols_set = ["RSPAMD_HOST"];
+}
+
 MAILCOW_DOMAIN_HEADER_FROM { 
   type = "header";  
   header = "from";