Backpages.com Auto Poster and Auto Responder

I want a website that allows me to automatically post ads with or without pictures to [login to view URL] to any category. It should be completely automatic allowing me to set start and stop times, and post at intervals I designate. I also want it to seek out ads with key words I designate, and automatically respond with a message I write. It must not send messages to ads that have words on my negative key word list. I want the auto responder to be as automatic as possible with start and stop times. It should also allow for pictures. The website should allow the administrator to login using a password and create user names and passwords for others who will have access. The admin can delete or change passwords as well.