99% of times we need to send proof that we are students, what is interesting is that many companies accept that even if it's not in English. Probably on good faith.
In Brazil, universities can use .edu.br, but we have few universities providing email addresses to students and also, the majority of grad schools in Brazil are not universities but a small college called 'University Center'
Only one university in Germany has a .edu, and their students obviously manage to get far more benefits than those of us with an @informatik.uni-kiel.de email.