As this is a web-based server, you can access your emails from anywhere.
It is well-known for its instant messaging feature.
If you forget your password, you can easily recover it by using an SMS-based protocol.
It allows users to connect Dropbox files to their emails.
It also has a feature that allows you to "undelete" emails.
Above given are the best features of Rackspace email settings. See Also this post:- https://www.bloglovin.com/@datarecovo/steps-to-log-in-appsrackspacecom-webmail-8395405