If you get a complaint, don’t throw up barriers. Break them down and resolve the issue. We’re all human and there will be mistakes. The bigger mistake is not looking at a complaint as a gift.
Be visible in the work space even when you're up to your eyeballs in deadlines. A five minute break for coffee and a chat with a co-worker could give you a mental lift and that presence your boss encourages.
Proofread, then send. Don't send information out to the wrong people, or too early. Save yourself the trouble and double check before you send.