Don't send presence to matrix.org

Author: turt2live

synapse/federation/sender/__init__.py

@@ -882,6 +882,10 @@ async def send_presence_to_destinations(
             if self.is_mine_server_name(destination):
                 continue
 
+            # T2B: Skip sending presence to servers we know don't support it
+            if destination == "matrix.org":
+                continue
+
             self._get_per_destination_queue(destination).send_presence(
                 states, start_loop=False
             )