since v10.0.16

The extension point MailInfoTabProvider is a java interface that can be implemented to display and provide content for additional tabs in the mail info area of the novomind iAGENT Supervisor and agent frontend.

Your plugin has to return an object of type MailInfoTab. The MailInfoTab specifies a label for the tab to be displayed and a URL for the tab's content. The URL can be the path to a custom JSF xhtml file included in the novomind iAGENT Supervisor/Agent frontend. The path has to be specified as a relative path inside the META-INF/views directory of your plugin jar file.

For a complete example take a look at the Hello World Mail Info Tab App.