More work to ensure messages from a node are valid for the domain, and fix domain flatten to check for zone if one is supplied

app/Models/Address.php

@@ -530,7 +530,7 @@ class Address extends Model
 				$do = $zo?->domain;
 			}
 
-			if ($do && $do->flatten)
+			if ($do && $do->flatten && (($ftn['z'] === 0) || $do->zones->pluck('zone_id')->contains($ftn['z'])))
 				$o = self::findZone($do,$ftn['n'],$ftn['f'],$ftn['p'],$trashed);
 		}