An auto responder or a vacation message, are emails that will be sent out automatically when somebody sends an email to you. This is practicall if you are not in your office for a while and would like your customers to know that.
To setup such a vaction message or auto responder, login to your webmail first.
Once logged in, you either end up in your webmail directly, or on the setup page.
The setup page looks like this:
Click on the Autoresponder link to setup your auto responder.
If you do NOT see that page,