Yet, sometimes compiling the right words can be a bit daunting. You want to be polite, clear, firm, and perhaps even a little festive. Plus, it’s often a task we leave until we’re just about to run out the door for a holiday break.
I just say “following my return to the office” because saying “as soon as possible” isn’t actually when I’m going to respond — I may have other priorities when I get back that take precedence over responding to a week old email that wasn’t important enough for them to contact my backup. That said, it doesn’t bother me when other people do it!

An out of office message is a compact text that conveys the most important facts: How long you’ll be unreachable, when your contacts can expect an answer, (optionally) the reason for the absence, and, if necessary, a personal note. A referral to another email address, e.g. to one of your colleagues, is often helpful or even necessary.
I worked at a public agency and would have different out-of-office messages for internal and external. I was chastised for having a “too informal” message- because the idiot talking to me didn’t realize me saying “I’ll be back next Tuesday for the big staff meeting” (or whatever) was just for co-workers and not the public. I told them but of course it didn’t matter. So from then on I always made sure to start my internal OOOs- “Hello Company X comrade…. blah.” So it was clear which was which. I am not able to respond to your email promptly because my husband died. I will not be accepting zoom invitations. Please do not respond by suggesting future alternative dates. I don’t know when I will be able to speak without crying.