meaning of mail slot in Longman Dictionary of Contemporary English

what is a mail slot   Dan what is an expansion slot

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a slot through which mail can be delivered see moresee less type of: slot a small slit  Mail Slot · Heavy Reclaimed Iron reclaimed door mail slot · Stainless Steel Door Post Slot, Mail Slot, Post Slot, C4 Letter Drop, Mail Chute, Swing Letter Door

demo slot spadegaming enlarge image a narrow opening in a door or wall through which mail is delivered Take your English to the next level The Oxford The rule actually comes from the postal operations manual, and basically what it breaks down to is you are supposed to get permission from