http://www.autoresponderpro.net/easy-autoresponders/
Please Help! How and where would I set up an Auto Responder for emails on my website? Would this go into…?
the Mysql database or just in the File Manager for the website? What would be the easiest thing to do? Also, are there any reliable and free autoresponders out there? Thanks in advance!
An auto responder to site generated emails would go into the php code, you could carry the data (subject response, message) in mysql for flexibility. For a general email auto responder you need to run it from the mail server or possibly a client, though most clients do not have the capability.
A Free Autoresponder In 3 Easy Steps