Sealing a mail slot in a door

Hi all I want to seal the mail slot in the front door of our house It is nothing more than a giant hole sucking hotcold air and my money

Discover the elegance of Hardware Box's Mail Slots Collection, where functionality meets sophistication for your front door Available in Satin Nickel,

mailbox slot for door Custom Outgoing Mail Slot for Vertical Mailboxes Door Size: 16H x 5-12W Features: Vertical Mailboxes are USPS Approved ONLY for

mailbox slot Door Accessories · Wall Hardware · Hooks + Racks · Shelves + Ledges · Outdoor Hardware · Door Bells · House Numbers + Signs · Mailboxes · Bathroom + Kitchen