The following steps to forward your email to another email address.
Login to Plesk Panel using current username and password.
Go to the domain name and click Mail.
Select the email address.
Go to the forwarding tab then check switch on mail forwarding,write any Email ID where you want to forward your message on Forward incoming messages to the following e-mail address text area then click OK.
Once forwarding is created, you could see it in the list of forwarded to another Email ID.