the difference is...
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There is little difference between putting a letter in the mail box verses dropping it off at a post office. It does save the time in having to queue for a stamp if the post office is busy and you can put a letter in the mail box even when the post office is closed.
The definition of a bulk box can vary. Typically, the definition of a bulk box states that a bulk box is a pallet sized box that is used for shipping or storing various items.
An empty square box in a text does not have a specific meaning. It often means that the encoding of the text messed up and couldn't send what was typed so it sent an empty box.
of course not! when it get to their inbox, it's not yours to delete anymore
It is a Post Office Box. Instead of having something sent to an address of a place, you can organise a post office box through your post office and the post will be sent there. You can then collect it. It is a way of keep an actual address private.