1. With Outlook open click on File 

2. Find and click on Automatic Replies (Out of Office).

3. In the Automatic Replies box, select Send automatic replies.

• Optionally, set a date range for your automatic replies. This will turn off automatic replies at the date and time you enter for the end time. Otherwise, you'll need to turn off automatic replies manually.
• On the Inside My Organization tab, type the response that you want to send to teammates or colleagues while you are out of the office.

• Note: Sending automatic replies to anyone outside my organization will send your automatic reply to every email, including newsletters, advertisements, and potentially, junk email. If you want to send automatic replies to those outside your organization, we recommend choosing My contacts only.

4. Click on OK to save your settings.