Best way to seal off a mail slot

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If you do want to do it, the easiest way is to just put some shrink wrap over it Get some double-sided tape, make a square around the mail slot

INSULATING LETTER-BOX SLOT FOR METAL-, PVC-U AND WOODEN DOORS Function mail: info@ outside inside door-leaf door-leaf  This premium quality, weather-resistant aluminum Draft Dodger mail slot comes with an insulating rubber seal that blocks drafts and an interior brush

male cord female slot Plumbing & Pipe Insulation · Window & Door Screens · View All Products · PDF Mail Slot – 10″ Aluminum mail slots from M-D Building Products are durable Make mail delivery easier and more secure with a door mail slot or in-wall mailbox slot Find out more about mail slot options at