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Your CS email address is your account name followed by @cs.uchicago.edu This is distinct from your University account and email address. By default, we forward all of your CS mail to your @uchicago.edu address.
If your email is forwarded to uchicago.edu, you must read up on where's my mail. If your email is not forwarded, you can use Webmail or Setup a Mail Client
Use Webmail or Setup a Mail Client.
See this article: mail_forwarding