To add mail forwarding in Plesk control panel, you can follow these steps:

Step 1: Log in to your Plesk control panel using your username and password.

Step 2: Go to the "Mail" section. This section may be labeled as "Mail Accounts" or similar, depending on your Plesk version.

Step 3: Locate the email account for which you want to set up a forwarder and click on its name.

Step 4: In the email account settings, Click on the "Forwarding" tab or option.

Step 5: Enable the forwarding option by selecting the checkbox next to "Switch on mail forwarding."

Step 6: Enter the email address where you want to forward incoming emails in the "Forward to address" field. Make sure to enter the correct email address.

Step 7: Optionally, you can choose additional forwarding options such as keeping a copy of forwarded messages in the mailbox or forwarding only specific types of emails.

Step 8: Click on the "OK" or "Save" button to save the forwarder settings. You should see a confirmation message indicating that the forwarder has been successfully added.

By following these steps, you should be able to add forwarders in Plesk control panel. The forwarders will redirect incoming emails from the specified email accounts to the specified forwarding email address. This can be useful if you want to receive emails in multiple email accounts or forward them to another address for centralized management.