You can configure email forwarding via Plesk. To do so, folllow the steps below.

1. Log into Plesk
2. Select the domain under which the mail account is configured
3. Click the Mail tab
4. Click on the email address you want to update the forwarding for
5. Select the Forwarding tab
5. In the field enter the email address you would like to forward to and click ok.

After this any emails will be forwarded onto the account specified.