diff --git a/synapse/handlers/_base.py b/synapse/handlers/_base.py
index 1773fa20aa8fc30732de7e367f43ce315ab011de..349a52b85c806bf86d618fba266a93ab6e2933b1 100644
--- a/synapse/handlers/_base.py
+++ b/synapse/handlers/_base.py
@@ -133,10 +133,9 @@ class BaseHandler(object):
         for k, s in context.current_state.items():
             try:
                 if k[0] == EventTypes.Member:
-                    if s.content["membership"] == Membership.JOIN:
-                        destinations.add(
-                            UserID.from_string(s.state_key).domain
-                        )
+                    destinations.add(
+                        UserID.from_string(s.state_key).domain
+                    )
             except SynapseError:
                 logger.warn(
                     "Failed to get destination from event %s", s.event_id