Outlook: Set out of office message for Shared or Delegated Mailbox
You may want to set an out of office message for a mailbox that is not monitored or where an employee is no longer employed by the company. You can use this guide as a reference to setting up the out of office message for a mailbox that has been shared with you.
1. Open the Mailbox in Outlook Online. See this Article if you need Help openning the mailbox.
2. Open Settings
3. Click on "View all Outlook settings"
4. Go to Mail > Automatic Replies
5. Turn on and configure the automatic reply settings as needed. Press Save when done