An auto-responder email is an e-mail that's sent back instantly to everyone who sends an e-mail to a mailbox with this feature activated. The senders will get the automatic answer when their messages are received and you'll not need to do anything whatsoever by hand. A few instances of making use of auto-responder emails are mailing a validation that a transaction has been received and also the order is now being prepared or that an individual is on a break and won't be around for a specific period of time. In the first case the function can be enabled for a long time, whilst in the second one it is non permanent. Even when you make use of e-mail exclusively for private communication, you may use an auto-responder to let the other side know their email has been received successfully.