Handling replies
When a person replies to your emails, that reply by default will go back to the originator of the email message. In Outlook 2016 and later, you have the option to redirect replies to another email address than yours. This is very useful if you are going on vacation and want messages replied to someone other than yourself for that time period.
To have replies directed to someone else, click the Options tab | Direct Replies To.
Within the Properties dialog box, Delivery options will have a checkbox by Have replies sent to. If the box is not checked, you need to check it.
In the box to the right of this, enter the name of the email ID that you want the replies sent to from now on. You need to remember to change this as needed. If you prefer, or do not know the email address, you can click on the Select Names… button...