diff --git a/homedecor_inbox/init.lua b/homedecor_inbox/init.lua
index 6d870dc4..7998fd6b 100644
--- a/homedecor_inbox/init.lua
+++ b/homedecor_inbox/init.lua
@@ -79,6 +79,7 @@ homedecor.register("inbox", {
 			if inv:room_for_item("main", stack) then
 				return -1
 			else
+				core.chat_send_player(player:get_player_name(), S("This mailbox is full."))
 				return 0
 			end
 		end
diff --git a/homedecor_inbox/locale/template.txt b/homedecor_inbox/locale/template.txt
index 8c11f35c..724d7736 100644
--- a/homedecor_inbox/locale/template.txt
+++ b/homedecor_inbox/locale/template.txt
@@ -1,3 +1,4 @@
 # textdomain: homedecor_inbox
 Mailbox=
 @1's Mailbox=
+This mailbox is full.=