diff --git a/core/admin/mailu/__init__.py b/core/admin/mailu/__init__.py
index 4d7efba1..f9ca2466 100644
--- a/core/admin/mailu/__init__.py
+++ b/core/admin/mailu/__init__.py
@@ -20,7 +20,7 @@ def create_app_from_config(config):
     # Initialize application extensions
     config.init_app(app)
     models.db.init_app(app)
-    KVSessionExtension(RedisStore(redis.StrictRedis().from_url('redis://{0}/3'.format(config['REDIS_ADDRESS']))), app)
+    KVSessionExtension(RedisStore(redis.StrictRedis().from_url('redis://{0}/3'.format(config['REDIS_ADDRESS']))), app).cleanup_sessions(app)
     utils.limiter.init_app(app)
     utils.babel.init_app(app)
     utils.login.init_app(app)