To configure email forwarding in Plesk, Follow the steps below:
1. Click on the Mail tab
2. Select an e-mail address
3. Click on the Forwarding tab
4. Click on the “Switch on mail forwarding” if it is not switched on already
5. Type in an e-mail address you want to forward e-mails to
6. Click the OK button.
You can also check how to create email aliases in plesk