The Buttondown plugin integrates the Buttondown email newsletter service with Obsidian, enabling users to draft and send newsletters directly from their vault. Users can compose emails as markdown notes and seamlessly create Buttondown drafts with a single command. The plugin sets the note’s filename as the email subject and its content as the email body. Once sent to Buttondown, the drafts can be reviewed, edited, and scheduled or sent via the Buttondown interface. This tool is ideal for managing newsletters in a markdown-friendly environment while leveraging the powerful features of Buttondown.