What we need in our work communication is not more professional politeness or less formal, chat-based messaging applications like Slack. We need honesty. The problem is that we’ve conditioned ourselves to see honesty as self-indulgent or disrespectful. I’d argue the opposite is true. Honesty, even if it’s a bit more inconvenient for all parties in the moment, pays dividends later. It builds trust. When my partner Anne Helen Petersen and I were interviewing people for our forthcoming book on remote work, a frequent lament from both middle managers and workers was that they didn’t feel like they knew how to succeed in their jobs; that they were guessing what their superiors and coworkers wanted and, even when they asked, they didn’t quite trust the responses they got back.
17. "Hello! You've gotten the voicemail of [your name]. Leave your name, contact info, and the answer to the eternal question ‘Which came first, the chicken or the egg?' Anyone who gets it right will receive a call back."

If you work in an industry (like PR, for example) where clients expect a response in a matter of moments or hours, you may need to set an out-of-office message if you’re absent for an afternoon. If you’re not sure whether you should set one, ask your boss or a coworker or consult your employee handbook.
Sample out-of-office email message: “Thank you for your message. The University of Toledo is closed for winter break. If your message requires a response, I will reply after New Year's Day during normal business hours. Happy holidays!”