A computer program that has an ability to automatically answer an incoming mail is known as autoresponder. These are generally predefined message set by the recipient.

Autoresponder feature is most commonly used when a recipient is not available for a period of time.

In recent time, autoresponder is widely used as an effective e-mail marketing tool that is capable of providing information to target market or potential customer about the product and services offered by the company and follow-up with them at preset time intervals.