Earlier quoted context omitted.
> While it gives a problem with certain websites (don't consider it a valid e-mail address) Are you saying that there are sites out there which don't accept mailbox@subdomain.example.com a valid email address? If so, that's beyond broken...
My school's student addresses ended in @u.northwestern.edu. You can imagine this was annoying sometimes when email addresses ending in .edu were used to verify student status.
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.