Great question. This is the default automatic inquiry responder. This will be sent as a response to an inquiry if none of your other inquiry responders should be sent based on their rules. To customize this message, add an inquiry responder to the end of your list that has absolutely no conditions (it always sends if nothing before it sends). Make sure it is on the end of your list, otherwise it will block anything that comes after it. Here is an example of how to set this up.