diff --git a/roles/shell/files/etc/postfix/main.cf b/roles/shell/files/etc/postfix/main.cf
index b400b4c..3872444 100644
--- a/roles/shell/files/etc/postfix/main.cf
+++ b/roles/shell/files/etc/postfix/main.cf
@@ -78,3 +78,7 @@ milter_default_action = accept
 
 smtpd_milters = inet:localhost:12301
 non_smtpd_milters = inet:localhost:12301
+
+# message delivery requests that any client is allowed (50/hr)
+smtpd_client_auth_rate_limit = 50
+anvil_rate_time_unit = 60m