A Go to URL action is the correct Tableau action for opening an email client from a dashboard object. Tableau URL actions can target external resources and support the mailto: URL scheme. The analyst can configure the source sheet or mark represented by the envelope icon and use a URL such as mailto:support@example.com. When the user activates the configured action, the operating system opens the default email application with the destination address populated. Change Set Values modifies set membership, Filter actions restrict marks in target views, and Go to Sheet navigates to another worksheet, dashboard, or story in the same workbook. None of those actions can launch a pre-addressed email. Therefore, Go to URL is the appropriate action type for the requirement.