A professional out of office message, or OOO message for short, are autoresponder email messages that reply to incoming emails. They tell the sender that you are away from your desk and have limited access or no access for a specified period of time. This action lets them know that you will be unable to respond in a timely manner and then guides the recipient in the right direction.
Out of office messages can vary in length and tone, depending on the situation. For example, if you’re going on vacation for two weeks, you may want to greet the email sender with a lighthearted response.