Add-on Auto-Reply to Topic

My apologies if this has already been requested/implemented, but googling auto-reply and auto-reply to topic/thread only came up with addons that auto-reply to conversations. That's not what I'm looking for. My gaming forum has a Reports section and an Application section. When forum users post new topics in these forums, I want the forum to automatically reply to the topic (i.e. explaining that their topic would be read and replied to within 24 hours.) Is there any addon that does this currently? And if not, this is my request for there to be one. :p

Nelson T.

I am looking for something similar that will post a welcome message in response to introductions of users.