The newsletter campaigns are the easiest email campaigns, which are send only once at a specific time and date.
Newsletter campaign content
Like any other campaign, there must be at least one campaign variation.
By default, every newsletter campaign is set to be send to all newsletter subscribers (the ones who unsubscribed or marked the emails as spam are not included). If you want to send the campaign to a specific segment of users, see more details here.
You can send a newsletter immediately after you finish creating it or you can schedule it for a specific time and date.