nudecanada

I was looking for similar the other day.

Here is one:
http://www.autoreplying.com/index.htm

Here is another:
http://www.tucows.com/preview/320095.html

And another:
http://www.tucows.com/preview/194092.html

I was looking for an auto-responder to run locally on our server written in perl, but could not find a decent one.

I think you might want to download a windows app, have it download your mail every 15 minutes, and autorespond to it.

I never tried any of the above, but I am sure one will work for what you want to do. It can't be that hard.

Good luck!