Patching a Mail Slot

Patching a Mail Slot interior mail slot cover Would a thick rubber flap on the inside work? Or should I instal a new mail slot, which will probably entail cutting a new hole in the door I interior mail slot cover Slot Cover and Extra Large Mail Slot Catcher

interior mail slot cover Reproduction interior mail slot Matching exterior slot available 2 Finishes, Brass and Antique Pewter 8-12 length with a 5-34 width

bat slot The No-Draft Mail Slot has two door flaps, both spring loaded and weather Easy to install by simply running a bead of silicone on both the interior Stainless Steel Door Mail Slot With Extra Large Mail Catcher And Combination Lock - 11'' X '' Mail Slot Cover And Extra Large Mail Slot Catcher