A method and system for providing e-mail messages to a receiving e-mail application. The locking member can occupy a normal over-center position rendering the first and second tracks integral in rotation, and a release position authorizing the displacement in rotation of a unit including the first track, the locking member, and the actuating member. The clamp portion has opposing ceiling support rail engagement portions separated by a clamping space sized and shaped for receiving a portion of the ceiling support rail of the drop ceiling.