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

mail slot cover interior   Dan mailbox slot for door

Mail slots are constructed of solid brass or stainless steel material and available in two popular sizes Interior & exterior sides of the mail slots have

More secure options now exist that can protect your home and mail better DuraBox is one brand that's great It is installed on the inside of your door so it Front Door Mail Slot

slot robot The one-piece Vertical Mail Slot fits discretely into any wall or door with ease The two-piece Standard Mail Slot comes with an interior trim kit and is Discover CRL's sleek, modern, secure door mail slots & package drops for glass doors Shop CRL, the industry leader in architectural hardware, today