I tried to send u another message and apple e-mail disappeared from
the dock.


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To re-add the application to your dock, first go to your hard drive then to applications then to the app.  Drag the app into the dock and it will stay.  Be careful not to drop it on the way to the dock.  Another way to do this is to do a spotlight search and launch the appliaction that way then right click or control click on the dock icon and select to keep in dock.