Rackspace Setup Instructions
To set up your new Rackspace email account, just click here, login with your email address and password, and follow the instructions!
When the setup assistant asks "How would you like to connect to the mail server?", choose POP if you would like it to work more like your existing Tortus mail account. (IMAP is better if you have multiple devices you would like to keep in sync with each other.)
Quick setup details if you are familiar with Email configuration
The new URL for webmail is http://rackspace.tortus.com/ (you can also change your password here).