Quote from Vinny1:
Mail can really be delivered just once or twice a week. You just get a bigger pile when you do get mail. Stamp prices can then come down.
Quote from stevegee58:
I remember my dad telling me he remembered mail delivery coming twice a day.
Quote from horseman:
If some people received mail on Mon, Wed, and Fri and others received mail Tue, Thur, Sat, then the PO could cut the number carriers in half