A nicely-chosen little scene. I think this would be a stronger photo, though, with a different composition - the angle of the mailboxes leads the eye naturally up and right, where it encounters a tree trunk that draws it vertically out of the photo. Cropping to avoid that might have been one option, or varying the angle.
The bright areas in this are also too bright - the all-white mailbox in particular seems to have no real detail to it, being washed-out by the light.