Email addresses are automatically created when you create a new user in the Parallels Small Business Panel. The only time you need to create email addresses is when you are create an email address for someone who is not a user. That lets you give someone an email address without giving them access to any other features, such as file sharing.
Note: For email to work correctly, your nameservers need to point to the server. For more information, see Setting Up Nameservers for the Parallels Small Business Control Panel.