Open web browser, Go to official website of Rackspace's email.
Enter the button of login. When you enter the icon of login, then a new page will open with the login dashboard for the company's various services.
Enter the email address and password in the given text field.
At last, enter the button of login to login your Rackspace webmail account.
See also this post:- https://datarecovo.hpage.com/steps-to-log-in-apps-rackspace-com-webmail-account.html