That’s right. An out-of-office response is an automated email message that will be sent back to anyone who shoots you an email while you’re on leave. They are important. For starters, you don’t want to appear snobbish, and… you might even get some new leads just by leaving a well-thought-of out-of-office email message.
Be aware of your tone. Keep it clean and simple. Sullivan says: “Even if you work in a casual office environment, the people emailing you may not. It's fine to have a light tone in your communications, especially when you're in an email conversation with someone directly, but your OOO is more of a blast message—including a cat meme or silly quote could backfire if your OOO goes to, say, a new client prospect or the sales director at a company you've been trying to engage.”

My mom works part time at a library in archives, where her personal work email is also the general archives email (ie LibraryNameArchives @ email . com). She has an out of office response that replies with her work hours (since she’s the only employee in the archives) so people know when she’s in the library and can respond or when they can come in and visit her. The only frustrating thing is that her email either isn’t capable of, or she doesn’t know how to, turn off the OOO email when she’s actually in the office, or doesn’t trust that she’ll remember to turn it back on. She’ll send me an email about something, I’ll respond, I’ll get an OOO response, she’ll respond, I’ll reply, I get an OOO reply, etc etc.
This is a notice to all tenants that leasing office will be closed on [date] in observance of [holiday]. Please contact [name] and [company] for any immediate concerns or questions. Thank you and may everyone have a safe and happy [holiday Name]