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-rw-r--r--synapse/push/pusherpool.py6
1 files changed, 6 insertions, 0 deletions
diff --git a/synapse/push/pusherpool.py b/synapse/push/pusherpool.py
index 21f14f05f0..4c7f5fecee 100644
--- a/synapse/push/pusherpool.py
+++ b/synapse/push/pusherpool.py
@@ -19,6 +19,7 @@ from typing import TYPE_CHECKING, Dict, Iterable, Optional
 
 from prometheus_client import Gauge
 
+from synapse.api.errors import Codes, SynapseError
 from synapse.metrics.background_process_metrics import (
     run_as_background_process,
     wrap_as_background_process,
@@ -113,6 +114,11 @@ class PusherPool:
             The newly created pusher.
         """
 
+        if kind == "email":
+            email_owner = await self.store.get_user_id_by_threepid("email", pushkey)
+            if email_owner != user_id:
+                raise SynapseError(400, "Email not found", Codes.THREEPID_NOT_FOUND)
+
         time_now_msec = self.clock.time_msec()
 
         # create the pusher setting last_stream_ordering to the current maximum