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

insulated mail slot
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Mail · By Location · By Myself · eService Insulated Bottle with Chug Lid in red Image of the Milwaukee PACKOUT 18oz

Dorex 465001 Insulated letter slot eliminates drafts and dust; Telescopic installation, Standard door thickness: 1 34 up to 4 14 thick

situs slot depo 5000 insulation performance, our DraftDodger™ Insulated Mail Slots cut drafts, reduce outside noise & odors, and offer increased security against

hit the diamond slot In order to avoid a draft during the winter, the previous owner had shoved some insulation in the mail slot and covered it with masking tape