Please include their names, phone numbers, and email addresses. If you handle multiple areas, let colleagues and clients know what each person specializes in so they can contact the right person for help.
Yeah, announcing you were going to delete emails unread and expecting the sender to resend when you return would NEVER fly in my office. I’d get executive complaints about that, especially if it went to a client or outside party – if a client can’t reach you, they will reach out to someone else who may not work at your organization and you lose business. I feel like this delete-it-all philosophy would only work for an entirely internal role where timelines are more relaxed, and even then, I feel it’s a bit unprofessional to foist your own catch-up work onto others, especially if they’ve been backfilling for you while you were OOO.

Sure, Kopelman is truthful about the fact that he’s on vacation, but he also lets the recipient know that he or she would be interrupting important family time if the first option is chosen. It states a point simply and uses humor to avoid making it sound like he wants the reader to feel guilty.
A separate after-hours attendant menu can inform callers that your office is closed, state your business’ operating hours, and provide options that callers can immediately act upon. For example, you can direct them to your website for FAQs. If your business provides an account login page, remind your customers that they can login at any time to get general account information. In this situation, be proactive.