To set up email forwarding for an email address, perform the following steps:
1 - Logged in to Plesk, https://your domain name:8443.
2 - Go Mail.
3 - Open Email Addresses tab.
4 - Select Email Address.
5 - Open Forwarding tab.
6 - Select the Switch on mail forwarding checkbox.
7 - Specify one or several email addresses to which email must be forwarded.
8 - Click OK.