You can use Rack Space's e-mail wizard to setup your email on your computer, phone or tablet. Just login with your up.net email address and password and select the kind of device you want to setup your email on. Rack Space will verify your account and provide step-by-step instructions and pictures.
Or you can use the following settings
IMAP (SSL): secure.emailsrvr.com (Port 993)
POP (SSL): secure.emailsrvr.com (Port 995)
SMTP (SSL): secure.emailsrvr.com (Ports 25, 465, 587, 2525)