4. save time in getting to the post office box or send mail to the postal service. Cost-effectiveness in delivery because, regardless of the quantity, weight, and distance is the same as regular postal mail .
4.-saving travel time to send a letter to PO Box address. Or post office Cost of delivery. Because regardless of weight. And the distance of a regular post mail.
4. Saves time on the journey to send a letter to the mailbox or post office, save costs in the delivery. Because regardless of weight. And the distance of the letter as regular mail .