How to cover this mail slot up so cold air won't come in?

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Typically for Doors & Walls Thicker Than 3 Inches Engineered for maximum insulation performance, our DraftDodger™ Insulated Mail Slots cut drafts, reduce This can involve replacing your front door with one that doesn't have a mail drop Or you could install a slot cover for a more cost-effective

cash collect silver bullet bandit slot MAIL SLOT BASKET CATCHER INCLUDED: Our D30-S door mailbox slot comes block your door space In addition, a combination lock is included to keep Typically, mail slots have two plates on either side of the door, secured with wood screws Occasionally, the front plate might be secured with