Autoresponders are emails created with an automatic response. The email will only send once the specified action is taken by a contact.
Autoresponders work in conjunction with triggers. You need to pre-create the auto response emails and link them to triggers. For example, you can send automated welcome mails to new subscribers, or confirmation mails when subscribers click on an RSVP link in a previous mail.
Navigate to Autoresponders by clicking Campaigns > Autoresponder.