diff --git a/source/_integrations/mailbox.markdown b/source/_integrations/mailbox.markdown
index b59f062feb1..3b84906b810 100644
--- a/source/_integrations/mailbox.markdown
+++ b/source/_integrations/mailbox.markdown
@@ -3,6 +3,7 @@ title: Mailbox
 description: Instructions on how to setup your mailboxes with Home Assistant.
 ha_release: 0.51
 ha_domain: mailbox
+ha_iot_class: ~
 ---
 
 Mailboxes provide a list of messages with short information about each. Mailbox messages appear on a separate panel in the frontend.