An auto-responder is usually a predefined e-mail, which can be sent automatically as an answer to every single e-mail received inside a mailbox with this option enabled. The two most typical examples for employing this function are automatic email messages that one is briefly away from the workplace or that an order has been received successfully. An auto-responder can also be used as a standard confirmation that the email is received successfully, which may be something quite important in business communication. The message which is sent can be pretty much anything and can be altered based on the situations and what the auto-responder will be used for. As the feature is enabled 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 person sending you an e-mail.