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

I use a close pin to attach the letter to the slot flap The mail carrier picks it up when he drops new mail into my slot You could use a

Can you put any package into a drop off slot as long as it fits? Heavy duty mail slot for use with our Rent Drop Boxes

I use a close pin to attach the letter to the slot flap The mail carrier picks it up when he drops new mail into my slot You could use a

mail slot privacy hood The mailers I use to mail the shirts are thin enough to fit into the slots in the lockers, but I didn't want to be rude inconvenience the

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mail slot cover plate letter , she dropped the letter into the mail slot , and she even pounded all around the mail slot with the heels of her hands to make sure it settled down

Mail slots are limited to receiving incoming mail, as most have no provision for securing and protecting outgoing mail for pickup by the mail carrier