The default Webmail login URL is www.yourdomain.com/webmail (don’t forget to substitute yourdomain with your actual domain). However, if your domain name isn’t pointed to our servers, you’ll need to use the server’s IP address to access your inbox via a browser.

This information is wrong. I have an email only account. I don’t use Scala for my domain hosting. This must only work if you host your domain with Scala.
That’s right. If your website is hosted elsewhere, you can use server name or IP address to access webmail.