Hello, [NAME] is away from the office. E-mail contact during this time may be irregular or nonexistent. When she gets back she will be swamped by the backlog. Try to forgive her; she is a mere human and thus, weak. This message was NOT sent by a human, but by a robot. We robots are neither weak nor fallible. We are tireless and will one day rule the Universe.
I used to work with someone who had a message telling people she only checked her email twice a day. You pretty much needed to call her if you needed anything outside of those times. (She worked in a remote office.) I think she had read one of those books on efficiency that recommended scheduled email time. But there were problems with this: 4. My department often had to email attachments or text to illustrate our questions/concerns. And we were on deadlines. Reading a page of text over the phone was not an efficient use of anyone’s time 5. She did outreach & was often out of the office on site visits, trainings, or travel to these places, but never ever set her OOO for these, because she was “working.” However, she was effectively not available to read emails from other staff until after hours on those days.

Like, I don’t feel confident enough to do it myself, but the OOO writer is probably a known Quirky Person and I admire that to an extent.
Once you’ve finally crossed off those last-minute items on your to-do list and are ready to check out of work mode for while, there’s just one last thing you need to do – set your out-of-office message.