Where does the profit from mom's post come from? I am optimistic that many people will get express delivery without paying.

The profit of the post office is generally divided into two parts. One is the delivery fee, that is, express delivery to your hands. Every courier company will pay a certain fee, but the profit is not high, about a few cents to one yuan.

Then make money by sending emails. If you send it to other places by express mail, the post office will also make a profit, which is higher than sending mail.

Another post station can also have some extra income such as group buying vegetables.