After I tweeted this example, dozens of people sent me examples of OOO messages they’d set or particularly good examples they’d seen in the wild. One example from a boss (via a TikTok) who offers emailers a decision tree of sorts. “Option 1.) Wait it out. Ask yourself, ‘is this urgent and important?’ If not, take a beat…you and I will be better off with this expectation set now,” the email begins. This one stands out because it’s extremely detailed, manages expectations and also offers who to contact in different situations. It models good behavior of taking time off, but also gives the original sender a variety of option. Most importantly, the responder forces the original sender to assess whether this is actually an urgent request.
It is regretted to announce to all of you that Mr. Neil Johnson who was the pioneer of our office due to cardiac arrest could not survive and met his creator. So, in condolence with his family, our office will remain closed for three days from 2-01-20XX to 04-01-20XX. During this time, all our office-related works will be postponed and you all will start working from 05-01-2020. If you have any problem and queries related to work you can contact Mr. Lewis Harris, he will answer all of your queries.

I know a lot of people who never vacation for more than a few days because the email backlog becomes incredibly stressful upon their return; this is one way to meaningfully combat that which is somewhat in the employee’s control.
A retired small town newspaper guy once told me about the first time the publisher went on vacation and left him in charge (this would have been in the 80s). The publisher told him “Don’t call me unless the building burns down, and even then, don’t call me until the fire is out.” Good example of management setting vacation expectations.