Buttondown Documentation
Represents the audience of an email, and to whom it is visible both in the initial email and in online archives.
Public emails are sent out to all of your subscribers and are available in your web archives.
Private emails are sent out to all of your subscribers but are not viewable in your web archives.
Premium emails are sent out to only paying subscribers (including those with gift subscriptions or on a free trial), and only premium subscribers can view them in online archives.
Free emails are sent out only to subscribers who are not paying for your newsletter (so you can send specific emails to convince them to pay, for instance!)