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The followign is the steps to set up your Rackspace email your Android device!
From the home screen on your device, tap the Settings icon.
2. Next, in the Incoming Settings section select IMAP from the drop down menu and enter your email address, username, and password. In the IMAP server field, enter "secure.emailsrvr.com" and be sure that SSL is selected and 993 is the server port.
3. Next, in the Outgoing Server Settings section, in the SMTP server field, enter "secure.emailsrvr.com" and be sure that SSL is selected and 465 is the server port.
4. In the last screen, give your newly created account a name and then select Finish Setup.
Another step by step article on configuring Rackspace email on a mobile device!