3.) Bienvenue chez l’AG de John Doe. Nos bureaux à Berlin sont maintenant fermés pour les vacances. Vous pouvez nous contacter pendant les heures de travail du Lundi ou vendredi de 9h à midi et de 13h à 18h. Pour des demandes, vous pouvez aussi nous envoyer un email sur [email protected]. Merci beaucoup. Nous vous souhaitons une bonne journée – votre AG de John Doe.
Plus, he incorporated a delightful technique to let people know that if they really wanted him to read their emails, they should probably send them again after his return. Not only does that keep the sender accountable by saying, "If this is really important, you know when to reach me," but it also helps him truly vacate his work while he's away. And that's hard to do.

I wish I’d copied it, but once a co-worker in sales had an out of office that was long and rambling and talked about how she and her family were “going to visit Mickey.” I didn’t know what to make of it, especially since it could go to prospective clients.
My OOO is almost always “I’m out of the office and will be returning on x date.” My email sig has instructions along the lines of “for questions on x, email this list” for a couple of the more common areas people would contact me about that might need an urgent reply (as the lists go to more than just me, obviously), but most people have finally figured out to contact those lists to start with, anyway. If I were in the middle of a project or something that needed to be moved along in my absence, the project teams usually know when we’re out, but I’d put a back up in that case, if needed, but generally there’s not much to be gained by a longer OOO from me.