Setup e-mail forwarding as an Admin in the Office 365 Admin Center
To setup e-mail forwarding as an Administrator, please follow the instructions below:
1. In the admin center, go to the Users > Active users page.
2. Select the name of the user whose email you want to forward and select the Mail tab.
3. On the Mail tab, select Manage email forwarding.
4. On the email forwarding page, select Forward all emails sent to this mailbox, enter the forwarding address, and choose whether you want to keep a copy of forwarded emails. If you don't see this option, make sure a license is assigned to the user account. Select Save changes.
To forward to multiple email addresses, you can ask this user to set up a rule in Outlook to forward to the addresses. For more info, check out Turn on automatic forwarding in Outlook. For Outlook on the web, see Use rules to automatically forward messages.