--- a/plugins/mod_presence.lua	Fri Dec 09 15:15:10 2016 +0100
+++ b/plugins/mod_presence.lua	Thu Dec 08 20:49:35 2016 +0100
@@ -201,7 +201,9 @@
 		end
 		core_post_stanza(origin, stanza);
 		send_presence_of_available_resources(node, host, to_bare, origin);
-		core_post_stanza(origin, st.presence({ type = "probe", from = from_bare, to = to_bare }));
+		if rostermanager.is_user_subscribed(node, host, to_bare) then
+			core_post_stanza(origin, st.presence({ type = "probe", from = from_bare, to = to_bare }));
+		end
 	elseif stanza.attr.type == "unsubscribed" then
 		-- 1. send unavailable
 		-- 2. route stanza