An autoresponder is an automated email system that sends pre-written messages to subscribers. However, there are different ways to describe this tool. Some popular synonyms for autoresponder include email automation, email responder, email marketing automation, email auto-responder, email follow-up, and auto-email. Other terms that can describe this tool include email sequencing, drip campaign, and lead nurturing. Each of these terms indicates the function of the autoresponder, which is to automatically send follow-up emails to subscribers. Regardless of which term you use, an autoresponder is an essential component of email marketing and lead generation that helps businesses stay in touch with their audience.