An auto-responder email is a an e-mail which is sent from your email address as a answer to each email that you get. The message is predefined and it is sent automatically, so each person who contacts you via e-mail will receive it the instant their message is received on the host that handles your email messages. This function is used when you need to inform individuals about various things, such as being out of the office for a given time period or that an order is received and is being prepared. The auto-responder e-mail also functions as a verification for anyone who contact you their message has been received, if you are not able to read it and make contact with them right away. It could contain any text of your choice and also it may be edited based on the specific occasion.