A letter-plate 1 comprises a frame 14, a sleeve 9 and a first flap 7. The frame is fitted around an aperture 5 on an exterior side of a door 4. The sleeve defines an inlet 10 and an outlet 11 on exterior and interior sides respectively of the letter-plate and, in use, lines the interior of the aperture. The sleeve is also arranged at an oblique angle to a vertical plane of the door and thereby to the frame. The first flap is pivotally mounted to cover the outlet of the sleeve on the interior side of the letter-plate. Pivotal movement of the flap relative to the sleeve is restricted by at least one stay 34 connected between the flap and a component 36 of the letter-plate in order to control the maximum angle to which the flap can pivot relative to the outlet of the sleeve. The pivotal movement of the first flap may be restricted by at least one pair of stays, a first stay of each pair being pivotally mounted and defining a slot along which a projecting portion of a second stay of each pair slides when the first flap is opened and closed.
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