Craigslist Crawler/Auto Responder

I basically want a site like [login to view URL] - Except it doesn't have to have the sign up functionality. Just some sort of back end. I do want the ability to use different keywords to send from different email addresses. So, basically.. I'll be using this to promote web design services from a few different people. The keywords need to be editable and so do the email addresses. So basically, from the back-end, I'd like to have an email, and for that email address a set of keywords. If it finds one of those keywords in a specified section of craigslist, it sends a pre-defined email to the person. Again, the email address, section of craigslist, and the email address would all need to be editable from the back end. The functionality to add more ad responders is required as well. It will basically follow this format. For (email address) if (keyword list) is found in (craigslist section selection), then send (email) to [email address listed in the CL posting] The things in parentheses MUST be editable from the back end, and more of these entries must be able to be added. I've got different email addresses that will have different keywords set. The language this is coded in doesn't matter to me. I'd prefer PHP but if you can make it work in something else, I don't care. I just want it to work.