If you have a backup copy of your email addresses or forwarders from another cPanel account, you can import them via the Import Addresses/Forwarders tool located in cPanel.
Click the tool icon and once the page loads you will be presented with two choices on what to import - Email Accounts or Forwarders.
They can be imported from .csv or .xls files. Choose the file from your local computer and follow the instructions on the page. This way the data will be populated simultaneously in your hosting account.