Make someone a VIP
In the Mail app on your Mac, select a message from someone you want to make a VIP.
Move the pointer next to their name in the message header, then click the star that appears.
You can also click the arrow in a Smart Address, then choose Add to VIPs.
If a VIP has more than one email address in the Contacts app, messages from all of their addresses are included in the VIP’s mailbox.