Send automatic replies
In Gmail, you turn on Vacation responder to have responses sent automatically while you're away. In Outlook, this is known as Automatic replies or creating an out of office message. Here's how you set it up:
Select Settings > View all Outlook settings > Mail > Automatic replies.
Select Turn on automatic replies.
Choose if you want to Send replies only during a time period.
Add a message for those inside your organization and choose if you want a message to be sent to those outside your organization.
Select Save.