An auto-responder is a predefined message, which is sent automatically as a reply to each email received inside a mailbox with this feature activated. The two most typical examples for taking advantage of this function are automated e-mails that one is briefly out of the office or that an order is received successfully. An auto-responder may also be used as a basic confirmation that the email is received successfully, which can be something rather important in business email correspondence. The message that is sent can contain pretty much anything and could be changed according to the conditions and exactly what the auto-responder will be used for. As the feature is activated server-side, there isn’t anything you are expected to do manually and you do not need an e-mail program to be enabled constantly for an automatic reply to be delivered to the individual sending you an email.