Classified Ads Auto Responder

I want an Auto Responder that will send automatic response **to people who place? classified ads** in? the domestic and householder services categories in? specific states of? the most popular Classified Ad (list) websites. The people who place? these ads should immediately receive my automated response.? I also want the ability to screen out certain words to prevent sending autoresponses to certain ads. It would also be nice if I could change the categories, and? my automatic? response? from time to time.? I dont have any particular design in mind as long as it is user friendly and operational.? A bonus and the possibility of more work will be provided if it can be made to work with? other popular classified ads websites such as [login to view URL], [login to view URL],? [login to view URL], or others. Thanks