mail box slots
Plastic Materials - MISUMI Vietnam
KYODOLED Wall-Mount Mailbox,Large Capacity Mail Box,Galvanized Steel Rust-Proof Metal Post Box,Mailboxes for Outside,15.7"x9.9"x4.9" Red.
8 Ways to Help Burglar Proof Your Mail Slot | SafeWise
Venia Solid Mail Slot for Front Door Stainless Steel Victorian Letter Box Plate.
How to configure front door with webapp slot? - Microsoft Q&A
ANTIQUE ORNATE VICTORIAN BRASS LETTER BOX WITH MAIL SLOT AND DOOR KNOCKER.