An autoresponder is a computer program that automatically answers e-mail sent to it. They can be very simple or quite complex. Autoresponders are often used as e-mail marketing tools, to immediately provide information to their prospective customers and then follow-up with them at preset time intervals. Autoresponders can be divided into two categories:
- Outsourced ASP model — these autoresponders operate on the provider’s infrastructure and are usually configurable via a web-based control panel. The customer pays a monthly usage fee. This is easiest to implement for the end-user.
- Server-side — enables users to install the autoresponder system on their own server. This requires technical skill.