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.
Thank you so much for your email. I love it already. It’s wrapped so nicely in its charming subject line that I just knew this message was going to be something special. Gifts like these just don’t come around every day.

So what makes a good automated response that will give you the reassurance you need to keep your work email under control so that you can truly enjoy your holiday?
Is your email urgent? If so, you should probably call [Name] at [phone number], and they will assist you. They aren’t in the sunshine – they’re still at work.