Where did that thought even come from? You have a job to do, and you’ll do it with pride, just like every other day. Through wind, rain, sleet, snow, and entitled nobles.
You put the letter back into the envelope and trot back into the post office. You tape it sealed, and drop it back into the mailbag to deliver. Noble or not, Star Catcher has never wronged you, nor have you ever heard of her being rude to anypony else.