Bless you for reminding (or teaching) folks to do this. I do all of the above and it's become a pet peeve that other people don't. I once got an email joke that had layers of previous addresses on it. I recognized one way down the pile that was a friend's address. I forwarded the email to her and she was p.o.'d to see that her address had been made available to so many people. I don't want mine floating around like that either.