When you go on vacation, one of the worst feelings is knowing that you’ll come back to a clogged inbox that will take you a while to go through. However, a great (and funny) way to reduce email volume and discourage multiple emails is with this example, telling users to choose what they email you wisely.
Be sure that you’re comfortable with the people sending you emails because while this is a funny OOO message, it’s also a little snarky about people who send multiple emails.
Example
I am on annual leave until dd/mm/yyyy. I will allow each sender one email and if you send me multiple emails, I will randomly delete your emails until there is only one remaining. Choose wisely. Please note that you have already sent me one email.