A couple enquires with three to five suppliers in one sitting, and the one who replies first usually gets the conversation. You are frequently at a wedding when that lands — that is the job. So the most valuable thing you can do for a new enquiry is the one thing you are least able to do at the time.
Your client gets an acknowledgement within seconds and you get the lead. You can see it working by sending yourself an enquiry from your own profile in a private window.
One acknowledgement per person per 24 hours, deliberately — a double-submitted form does not send two. If you would rather it said something different, add a note in the Leads inbox; if you would rather it said nothing, the same panel turns it off.