Electronic Directory, Issues, Error when changing email field in EDE

I tried to change my email in the mail field to netid@illinois.edu in the Electronic Directory Editor, but it gave me an error. What's wrong?

You must specify the full mailing domain, not just @illinois.edu:

For students with a Google Apps @ Illinois account, this will be NetID@g.illinois.edu.
For people with an Exchange (Office 365) account, this will be NetID@mx.uillinois.edu.

Updates in EDE take approximately 3-4 hours.

Please note: Faculty and staff can no longer redirect or auto-forward their university email. Please see this KB for more information: Privacy & Cybersecurity, Faculty and Staff Email Auto-forwarding Retirement FAQ