Dick, if you're talking about the header email addys - those are usually spoofed, and can be an interesting combination of user ID and domain name. I just got two "from" people I know - but neither of the domain names was correct for the sender. Just got off the phone with one of them (because both emails were ones that she had on her system, both originally from people she knows - one of which I don't know) and we're still not sure who the virus-laden emails originated with, since her machine came up clean this morning. She is running another scan now.
Very frustrating. Makes me think twice about even turning either of the PC's on these days - even though I don't EVER receive any email on them (except stuff I send myself for whatever reason).