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 read it as coming from a person who was overly frustrated with their regular OOO being ignored. It’s one of my pet peeves – the OOO clearly says I’m not there and to contact Bob, yet the sender continues to reply, never contacts Bob, then blows up at me when I return that their work is delayed. I would love to be able to send something like this message in the letter but it wouldn’t fly at my office.

Whatever style you may adopt, it’s still useful to know that some of the general rules apply to all instances: Stay consistent with the preferred communication style, particularly if you go for more creative options Double check for grammar and typos, as your template will be sent to many addresses Do not overdo it in terms of using unconventional style, particularly if you are not sure that it will fall on right ears with some of your customers Wrap-up
Loads of translators work freelance because it’s very easy to do from home, so yeah I’d not expect then to be standardised. I’ve received English and native language replies, but never both.