I'm from the states and I knew the USPS was closed on sundays for both deliveries and the offices. I have yet to receive mail on sundays so far so I cannot figure out if they do.
Sure yes I understand that many post offices have limited hours on saturday and not open on sundays but that does not mean they won't deliver on sundays. Just curious as I cannot verify this information by searching. Just a bunch of links reguarding the length of days required for delivery within Japan.
Thanks in advance and have a great day!
by sus_time