Unbind 3pids when they're deleted too

synapse/handlers/auth.py

@@ -825,6 +825,14 @@ class AuthHandler(BaseHandler):
         if medium == 'email':
             address = address.lower()
 
+        identity_handler = self.hs.get_handlers().identity_handler
+        identity_handler.unbind_threepid(user_id,
+            {
+                'medium': medium,
+                'address': address,
+            },
+        )
+
         ret = yield self.store.user_delete_threepid(
             user_id, medium, address,
         )

synapse/rest/client/v2_alpha/account.py

@@ -381,9 +381,16 @@ class ThreepidDeleteRestServlet(RestServlet):
         requester = yield self.auth.get_user_by_req(request)
         user_id = requester.user.to_string()
 
+        try:
             yield self.auth_handler.delete_threepid(
                 user_id, body['medium'], body['address']
             )
+        except Exception as e:
+            # NB. This endpoint should succeed if there is nothing to
+            # delete, so it should only throw if something is wrong
+            # that we ought to care about.
+            logger.exception("Failed to remove threepid")
+            raise SynapseError(500, "Failed to remove threepid")
 
         defer.returnValue((200, {}))