Yes, we do need to be warned about any scams that people find. Thank you to those who do warn us. It is so easy to be taken in.
I've had 3 emails recently purporting to come from friends (2 of them "from" the same friend). They had gone into my spam folder. When I checked the sender email addresses by hovering over them, none of them was anything like the proper addresses, so I didn't even think of opening them. Neither friend knew about it, but both said they would change their passwords. I would hope that if my contact list was used like that, that someone would tell me about it!