An autoresponder is a computer program that automatically answers e-mail sent to it. They can be very simple or quite complex.
The email marketers use autoresponders to send a series of emails generated automatically by a software. For example, you can subscribe to a 5-day course on about.com and you will receive an email a day for five days with the course contents.
Online email marketing softwares are also called autoresponders, although that’s just one of the features that is offered by them.
