If you Subscribe to a View or Workbook, you'll receive, at a chosen frequency, an email with snapshots of your visualizations. Like Alerts, it's a useful feature that allows you to receive insights directly into your inbox, without having to connect to Tableau Server. Each snapshot contains a link to the published visualizations, so if you spot something intriguing, click on the picture to automatically open the View in Tableau Server and start your analysis.
To subscribe, click on the Subscribe button in the toolbar and configure it on the window that opens. Here's an illustration of the Subscribe configuration window:
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