How to set automatic replies on a user's mailbox in Office 365

Applies to: Exchange Online

Introduction

This article describes three methods that administrators can use to set automatic "out of office" replies on a user's mailbox in Microsoft Office 365.

More Information

Method 1

1. Sign in to the Office 365 portal.
2. Locate Users > Active users (or Groups > Shared mailboxes if you set this on a shared mailbox).
3. Select a user who has a Microsoft Exchange mailbox. 
4. On the flyout menu on the right, locate Mail settings > Automatic replies (if it’s a shared mailbox, just locate Automatic replies on the flyout).

Method 2

1. Sign in to the Office 365 admin portal by using administrator credentials.
2. Expand Admin Centers, and then select Exchange.
3. Click the picture in the upper-right corner, select Another User, and then select the user mailbox that you want to change.
4. On the left side, select Options, click Organize E-mail, and then click Automatic replies.

Method 3

Run the following cmdlet in Exchange Online PowerShell:

Set-MailboxAutoReplyConfiguration

For more information about this cmdlet, see Set-MailboxAutoReplyConfiguration.

For more information about how to set automatic replies by users, see Automatic replies (formerly Out of office assistant).

https://support.microsoft.com/en-in/help/4019102/how-to-set-automatic-replies-on-a-user-s-mailbox-in-office-365