Added SENDER_ADDRESS and SENDER_NAME as variables for messages

data/conf/rspamd/local.d/metadata_exporter.conf

@@ -16,8 +16,7 @@ rules {
     backend = "http";
     url = "http://nginx:9081/pushover.php";
     selector = "mailcow_rcpt";
-    # Only return msgid, do not parse the full message
-    formatter = "msgid";
+    formatter = "json";
     meta_headers = true;
   }
 }