I will be out of the office starting (Starting Date) through (End Date) returning(Date of Return). If you need immediate assistance during my absence, please contact (Contacts Name) at (Contacts Email Address). Otherwise I will respond to your emails as soon as possible upon my return. Thank you for your message. How do you respond to holiday greetings? "And (also) to you!" You too! Thanks, same to you! Happy New Year to you and yours (when you want to extend the wishes to the other person's family) How do you let clients know you are going on vacation?
Obviously, I need to update it. And if you haven't changed your voicemail greeting in over a year, you're likely in the same boat.

I guess I generally dislike ones where the person is actually around but just might take longer than usual to answer emails (except in public-facing inboxes, etc.) I understand that if I’m using email, you might not respond right away.
If your request is urgent, there’s no use sitting idly in my inbox. So please send your request to [Contact Name] at [contact email]. Whether you prefer to stick with something simple or have a little fun with your holiday out-of-office message, it’s important that you always make sure to at least include the basics: your return date and an alternative contact people can reach out to for urgent matters.