You can download and edit one of these CSV files for the type of import you're looking to do.
4. At the Import E-mail Accounts/Forwarders section, for Step 1 select either E-mail Accounts or Forwarders depending on which you'd like to import, then click on Choose File and browse for the CSV file on your computer.
If you used one of the example CSV files, for Step 3 you'll want to leave Comma (,) selected as the delimiter, and also leave Treat first row as column headers selected then click Next.
5. On the next page confirm your source and target columns in Step 1, and select the domain these imports should apply to in Step 2 then click Next.
6. For the last step review the email accounts or forwarders to be imported, then click Finish. You should now see a import complete page.