What could be an electronic way to verify that someone is from a specific university department or university?

How could I verify that a person is a student/faculty/researcher at a specific department of any university in world? I could ask the user to verify the official email address provided by that university to him but not all universities in world provide a email address to their people. A considerably large percentage of universities do not provide.

What could be other ways to collect only verified people in some group for a university department ?