Email validation based on user type

I want to have two types of user accounts on my website. One for students and one for others. The student user type will require a .edu email address while the other type will not.

I cannot find a plugin for anything like this so I figured I need to validate it in the code.
I’m guessing ms-function.php would be a good place to start but I am not sure. I found this function
wpmu_validate_user_signup($user_name, $user_email)
which seemed relevant.

I’m not really sure how to approach this issue. Any help would be greatly appreciated.