Is it possible to soundproof a door with a mail slot?

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RF JWXTFC–Old fashioned bronze letter slot on the black front door of an English house, with an edge pattern and the word 'LETTERS' inscribed on the slot cover

door letter slot Google plastic wall access doors you will find many interior covers for your mail slot We use them all the time for access panels,

door mail slot catcher POCHAR Shop Stainless Steel Door Mail Slot with Extra Large Mail Catcher and Combination Lock