Why is that incredible? It is pretty common for many institutions to have that kind of email. Universities for instance often have similar emails so that just by looking at the email you know if the person is a teacher / student / temp worker and which chair they belong to, sometimes which campus in addition.
Many big companies have similar things to identify the BU of the email holder or indicate a contractor status (helpful for security policies).
Many big companies have similar things to identify the BU of the email holder or indicate a contractor status (helpful for security policies).