These messages are generally formal in nature and have the information about the unavailability of an individual and also the details of the person who can be contacted in his/her absence.
22. "Hi, you've reached [your name, the office of X company]. We're closed until [date]. Please leave your name and phone number and someone will return your call ASAP. Have a great [New Year's, Fourth of July, etc.]."

Most of what I’m describing (as well as boyd) boils down to examples of clear, honest, communication. While it sounds simple, such openness is extremely rare in the workplace. It is rare because, especially with time off, this type of communication requires the sender to be vulnerable, to cede control, and/or to be assertive and frank about one’s needs.
There ought to be a word - and perhaps there is, in German - for the mix of feelings that accompanies composing and activating a holiday out-of-office message. There's smugness, of course, and a gratifying sense of laying down one's virtual tools after a horribly long shift. But for many of us, these nice feelings are tempered by the knowledge that in two weeks, refreshed but depressed, we will have to trawl through hundreds of emails, many of which will be conference room notifications for meetings about crises that have passed.