[Rspamd] Do not normalise domains to eSLD for ARC

data/conf/rspamd/local.d/arc.conf

@@ -21,7 +21,7 @@ try_fallback = true;
 # Domain to use for DKIM signing: can be "header" or "envelope"
 use_domain = "recipient";
 # Whether to normalise domains to eSLD
-use_esld = true;
+use_esld = false;
 # Whether to get keys from Redis
 use_redis = true;
 # Hash for DKIM keys in Redis