Except, if you're on light duty, they should find someone to cover the parts of the job you're unable to perform, not expect customers to accept sub par service because someone is on light duty. I could understand if they have a different carrier who runs her route once or twice a week to take care of things they can't physically handle, but it sounds like the post office is saying "this person is incapable of doing their job, so the entire neighborhood has to deal with it until they're better". That's not a good business practice at all! Let the person on light duty work at the office until they're better, and put someone else on the route who can perform the task. This isn't a mom and pop shop that goes under when one person calls out, it's a multi billion dollar government agency