* **allowed_link_protocols** (Array) - Allowed protocols in links URLs, add at your own risk. http is always allowed.
* **birthday_input_format** - Default value is "ymd".
* **block_local_dir** (Boolean) - Blocks the access to the directory of the local users.
+* **dbclean** (Boolean) - Enable the automatic database cleanup process
* **default_service_class** -
* **delivery_batch_count** - Number of deliveries per process. Default value is 1. (Disabled when using the worker)
* **diaspora_test** (Boolean) - For development only. Disables the message transfer.