Where I live, there is no post on a Sunday. Of course, that doesn’t mean that the people who work for the postal service are idle; they are still beavering away in the background getting ready to deliver all that stuff on a Monday.
No postal delivery can be frustrating if you are waiting for a something to arrive. In the meantime it means no junk mail, no bills… It’s an exercise in patience, maybe.
The Post Office may be closed with no sign of life or activity. It just goes to show that appearances can be deceptive, all sorts of things might be happening inside. Service will be resumed in time, it will be a new day, and who knows what the post will bring.