I got added to a Black Board announcement list for some school. They don't seem to have a way to say 'stop sending this address mail'. I'm cranky, so I emailed the dean of student affairs about it.
He emailed back as if I were a student. I responded pointing out that I had no association with the school. He emailed back asking me to explain further, as there was someone with my name at the school. So I explained that I thought it was probably someone with the same name. At least that ended it.