How to insulate mail slot in door?

mail slot insulation
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This beautiful golden aluminum mail slot is part of Artec's Draft Dodger collection and provides unmatched insulation performance It's energy efficient

Installation instructions for an Elite Model DraftDodger™ Insulated Mail Slot when the existing

mail box slot Energy Efficient, Ideal for All Climates · Internal Brush Strip for Added Insulation and Privacy · New Design for All Thicknesses of Glass, and Even Insulating

mailbox slot in wall What I did with my own Tudor style home is pull out the old mail slot, stuffed the cavity with insulation, covered the cavity with a copper sheet using silicone