Is it really illegal for someone who's not a postman to use a mailslot

A: Thank you for your interest in our products This product is intended for standard wooden or metal doors by Architectural Mailboxes Nov 9,

Door Mail Slot By Telescopic Sleeve & Gold Sealed Flap - Compatible with Any Door Type mailbox $

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mailbox slot What size tenant doors do you need? The 4C mailbox offers tenant boxes in three sizes: MB1 , MB2, and MB3 The higher the number after the MB, the