Here's how to set up a vacation response:

  1. Click the gear icon in the upper right, then select Settings.

  2. From the General tab, scroll down to the Vacation responder section. 
  3. Turn Responder On, Enter a Start and End Date, and enter the subject and body of your message.

  4. If you've enabled a personalized signature in your settings, Gmail will automatically append it to the bottom of your vacation response.
  5. Check the box next to Only send a response to people in my Contacts if you don't want everyone who emails you to know that you're away from your mail. You'll also see an option to only send a response to people your domain. If you check both of these boxes, only people who are in your contacts and domain will receive the automatic response.

  6. Click Save Changes.

  • While the vacation responder is enabled, you'll see a banner across the top of any Gmail page, displaying the subject of your vacation response. 
  • To stop Gmail from automatically sending the response, click end now within the banner. Or, if you'd like to edit the response, click vacation settings.