Can you put any package into a drop off slot as long as it fits?

Can you put any package into a drop off slot as long as it fits? mailbox drop slot adjustable-through-the-wall-mail-drop-slot This Mail mailbox door slot A letter box, letterbox, letter plate, letter hole, mail slot or mailbox is a receptacle for receiving incoming mail at a private residence or business

mailbox door slot Also, mail slots deter mail theft as passerby cannot reach into a slot and retrieve mail as one could with a mailbox Curbside mailboxes and drop boxes for

mailbox drop slot A through the wall mail slot is a convenient way to allow customers or employees the ability to drop off small packages or envelopes without needing to come in mail drop noun 1 : an address used in transmitting secret communications 2 : a receptacle or a slot for deposit of mail Examples of mail