diff --git a/data/conf/postfix/main.cf b/data/conf/postfix/main.cf
index b0fda8bb..bd8f76ed 100644
--- a/data/conf/postfix/main.cf
+++ b/data/conf/postfix/main.cf
@@ -19,7 +19,8 @@ bounce_queue_lifetime = 1d
 broken_sasl_auth_clients = yes
 disable_vrfy_command = yes
 maximal_backoff_time = 1800s
-maximal_queue_lifetime = 1d
+maximal_queue_lifetime = 5d
+delay_warning_time = 4h
 message_size_limit = 104857600
 milter_default_action = accept
 milter_protocol = 6