There are instances in which one person sends a message, but someone else needs to receive the replies. Outlook has a Direct Replies To feature to accommodate that need.
1. In a new email message, click on the "Options" tab.
2. In the "Properties" dialog box, check the "Have replies sent to:" box and enter the name(s) to whom the reply should be directed in the adjoining field.
3. Click "Close".
4. Complete the message and send it.
These instructions, along with illustrations, can also be found in SharePoint > Software Users Group > Shared Documents > Outlook-Office 365 > Direct Replies to Another Person.