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-rw-r--r--synapse/federation/sender/__init__.py4
1 files changed, 4 insertions, 0 deletions
diff --git a/synapse/federation/sender/__init__.py b/synapse/federation/sender/__init__.py
index 6266accaf5..b00a55324c 100644
--- a/synapse/federation/sender/__init__.py
+++ b/synapse/federation/sender/__init__.py
@@ -539,6 +539,10 @@ class FederationSender(AbstractFederationSender):
             # No-op if presence is disabled.
             return
 
+        # Ensure we only send out presence states for local users.
+        for state in states:
+            assert self.is_mine_id(state.user_id)
+
         for destination in destinations:
             if destination == self.server_name:
                 continue