For each of your e-mail accounts, you can set up an e-mail forwarding service that will send copies of all incoming messages to specific e-mail addresses.
Go to "Mail".
Select the e-mail address.
Go to the "Forwarding" tab.
Select the "Switch on Mail Forwarding" checkbox.
Specify one or several e-mail addresses to which e-mail should be forwarded. When specifying e-mail addresses, separate them with white space, commas, semicolons, or type each of them on a new line.
Click "OK" to apply changes.
That's it! Now you know how to set up e-mail forwarding in Plesk.