Okay, this is definitely not aimed at the typical movie goer. Colewell is a quiet movies that in my opinion rewards the patient viewer. It isn't dramatic or suspenseful and a cynical reviewer would probably blurt out that nothing happens in it. It is more of a slice of life film, a character study. It is also a gentle commentary on the changes in society as companies have become bigger and bigger and drive smaller companies out of business. Post offices don't exactly fit into that model, but comparisons can be made. If you are older like I am you may remember the phrase "going postal." That was before this age of mass shootings everywhere, back when the stress and pressure of an enlarging and transforming postal service drove employees to extreme violence. Nowadays it feels like that growing trend was the canary in the coal mine, and we see that sort of stress and pressure everywhere in life.
But there is no violence in this gentle character study, except for a few raised voices by townspeople who don't want to see their local post office close down. I write novels that start at point A and go to point B, so I am not a big fan of flashbacks in movies. But there is an interesting use of flashback here, and in fact I wish they went a bit farther with it concerning the main character's personal history.
Anyway, I highly recommend this film, though I suggest you not watch it when you are weary, because quiet films often require a more focused viewing, without distractions or cat naps. Take a break halfway through it if you need to. It may be worth it to you also.