An auto-responder email is an email that's sent back immediately to everybody who sends an email to an e-mail address with this feature activated. The senders will receive the automatic answer when their emails are received and you'll not need to do anything by hand. A couple of examples of taking advantage of auto-responder e-mails are sending an affirmation that a payment is received and also the order is being prepared or that an individual is on vacation and will not be around for a certain period of time. In the first situation the option will be enabled for a long time, while in the second one it is temporary. Even though you use an e-mail address simply for personal correspondence, you may use an auto-responder to let the e-mail sender know that their email is received successfully.