The newsletter email functionality allows you to create new newsletters or send a previously saved newsletter to your newsletter subscribers.
Please note: Newsletters are send to newsletter subscribers only.
The create a new newsletter email section:

Click on the “Create New Newsletter Email” button to open the newsletter details page.
The resume previous newsletter email section:

The resume previous newsletter email section lists all previously saved newsletters and allows you to resume a draft or a previously started newsletter email. It shows details about the internal newsletter ID, the subject of your newsletter, an abbreviated overview of the main content and the last update date of the newsletter draft.