To protect from spam when rspamd hang or not yet ready to serve requests postfix should reject incoming mail with temp error
@@ -27,7 +27,7 @@ maximal_backoff_time = 1800s
maximal_queue_lifetime = 5d
delay_warning_time = 4h
message_size_limit = 104857600
-milter_default_action = accept
+milter_default_action = tempfail
milter_protocol = 6
minimal_backoff_time = 300s
plaintext_reject_code = 550
Dmitriy Alekseev