As seen from the specification (https://wiki.ubuntu.com/Unity/LauncherAPI), Unity won't support DockManager API.
But you can always use this applet: https://launchpad.net/unity-mail
As seen from the specification (https:/ /wiki.ubuntu. com/Unity/ LauncherAPI), Unity won't support DockManager API.
But you can always use this applet: /launchpad. net/unity- mail
https:/