I have a coworker that purposely leaves them on the first day that she’s back in the office (even though it said she would be back today) because she thinks it signals that she’s still unavailable (while she needs some time to catch up.) I think it’s a bit confusing. I personally would feel weird doing it because it seems like I just never came back from vacation.
I’m out of town. I’m looking forward to connecting with you when I return. If you’re getting this note, it means that I’ve received your email. (Thank you!) I’ll respond to your note as soon as I can. In the meantime, here’s a list of five questions that I get asked often. I’ve included brief answers to each one below. Take a peek. You might find the answer that you’re looking for—right away! [Include brief FAQs here] I hope those FAQs were helpful. Don’t worry, though—even if your question was one of the questions listed above, I will still send a personal response to your note as quickly as I can, just to make sure that your question or problem has been completely resolved. Talk to you soon!

I actually think that’s a really helpful out of office message? I appreciate how clear it is about who to contact in which circumstance (so you’re not having to do the awkward dance of trying to track down the right people while not inconveniencing the wrong ones), while maintaining a friendly-but-firm boundary around the vacationing person’s time (since none of the options include things like “here’s my cell phone number!”).
I had to explain to her that the email was still there, just like a voicemail, they’d get it on their return.