An auto-responder is usually a predefined e-mail, that's sent automatically as a reply to each and every message received in a mailbox with this function enabled. Two of the most typical cases for taking advantage of this function are automatic e-mails that one is briefly away from the office or that an order has been received successfully. An auto-responder can also be used as a general confirmation that the email is delivered successfully, which is often something quite important in business email correspondence. The message which is sent can contain more or less anything and can be altered depending on the circumstances and what the auto-responder will be used for. As the feature is activated server-side, there isn’t anything you need to do manually and you do not need an email application to be active all the time for the automatic reply to be delivered to the individual sending you an email.