This article explains how to set up an out of office message in Gmail using a web browser or the app. An autoresponder automatically sends a reply to anyone who emails you, letting them know that you're away and how often you check your email (if you do).
How to Set Up Out of Office Auto Reply in Gmail
You can set up an out-of-office message to say anything you want, including who you should contact while you're away. Follow these steps to create an automatic out-of-office message in a web browser:
Select the Settings gear in the top right corner of Gmail.
Select Show all settings.