An auto-responder email is a an e-mail which is sent from your email address as a reply to each e-mail that you receive. The content is predefined and it is sent automatically, so each and every individual that contacts you via electronic mail will receive it once their email is received on the server that takes care of your e-mails. This feature is used if you need to inform individuals about various things, like being out of the office for a given period of time or that an purchase has been received and is currently being processed. The auto-responder email also serves as a confirmation for people who make contact with you their email is received, if you are not able to read it and make contact with them at once. It could contain just about any text of your preference and it can be modified with respect to the exact occasion.