The best I ever saw for an out of office was a gentlemen named David at a unnamed large crane manufacturer. His read "I am currently out of the office, please contact someone else". No names, no numbers, no dates, nothing. I called him out on it when I had a meeting with the powers of the company years ago. He said it was an honest mistake the first time and people loved it so much, it was all he ever used. He was the service manager. Hard to believe that was ok. but I laughed ever time I saw it.