An auto-responder email is a a message that's sent from your email address as the answer to each e-mail that you receive. The message is predetermined and it is sent automatically, so each person who contacts you via e-mail will get it once their e-mail is received on the server that handles your e-mails. This feature is used if you need to notify people about different things, including being out of the office for a given period or that an order is received and is currently being processed. The auto-responder email also serves as a confirmation for the people who make contact with you that their e-mail is received, even if you're unable to read it and get back to them right away. It could contain any kind of text of your choosing and also it can be edited based on the particular occasion.