What is another word for mail slot?

Budget Mailboxes Stainless Steel Mail Slot mail slot through wall 4035 Mail Slot - standard mailbox slot for door User My father installed a mail slot in a wall He made a ramp from plexiglas, from the slot to a wood box The wood mail box was in their

mail drop slot Description Made in Australia A4 landscape or portrait mail slot Exterior wall, and make it obvious for the postie where to deliver mail Available