It is a much more convenient way to create new email accounts(boxes) from your hosting control panel. Please follow the steps below.
1. Login to your hosting control panel.
2. Click on "EMAILS" >> "Emails" >> the person icon.
3. Click on "+Add email user" to create an email account.
4. Fill the email username, password, first name, and last name to create it. If you would like to set auto-forwarding for your newly created email account. You can set it as below.