Autoresponder email is triggered when someone subscribes to your specified list on MailMunch. It can be used for a variety of use-cases such as the welcome email, coupon code email, and content upgrade email.
Welcome Email: A standard email sent to your new subscribers in order to welcome them to your list.
Coupon Code Email: Giving away a discount on your site? Ask visitors for an email address, and then send them an email with your discount code inside.
Content Upgrade Email: Send content upgrade to your subscribers with an instant email.
Also, it cannot be sent to users created before the campaign went live or for sending out follow-up emails.