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.”
If you’re going away on vacation, it’s very useful to set an automatic “out of office” reply for your emails. These automatic replies let people who email you know that you are not available to reply to their messages. Here’s how to set up an automatic out of office reply in the Microsoft Outlook desktop app and the web version.

Whether you’re looking for something straight-laced and formal or over-the-top festive, here are six different holiday out-of-office messages you can use depending on what you feel would be perfectly suited to you, your company, and this time of year. Out of Office Template #1 For the Person Who Works at a Traditional Company
Holiday messages are short quotes, where people wish happiness or luck upon others. Employees generally issue these messages before certain festivities as a courtesy or to let recipients know that you care about them. Depending on who the recipient is, your holiday message may be more formal or casual in tone.