Allow any email address. I'm at mcmaster, which has a mcmaster.ca address. I don't think it's possible to match on email address to allow all schools, so just

Allow any email address. I'm at mcmaster, which has a mcmaster.ca address. I don't think it's possible to match on email address to allow all schools, so just ask for the school that someone attends. If you let some non-students through, what does it matter?