Click the cog and select ‘Settings’Scroll down to ‘Out of Office AutoReply’Specify a time periodWrite your out of office emailConfirm other details and press ‘Save Changes’
I’ll be back in front of my computer on [date] and will respond to your message at that time. If you need immediate assistance, please send an email to [contact name] at [contact email]. For Those Who Intend to Chill in a Galaxy Far Far Away (Where There Is No Internet)

I used to work at a place where we would occasionally send reports of network misuse that sometimes included inappropriate images the user had stored on work devices. One person had an email system that was somehow set up to make any attached images the profile pic for that account. So she would end up with random pornographic images as the profile pic whenever she received reports from us. She said she had no idea how to change it and could we please help? Since she was not part of our company, and I have no idea how that could even happen, I just started sending her kitten pictures after every report that included an image. Problem solved.
Education Details: 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.