Ron,
Somewhere along the line, whether it be while surfing the web or just a worm attached to something you have downloaded or had sent to you attached to an email, they have got hold of your email address and most probably your address book. This is happening all over the place, not just yourself, so don't feel guilty about it.
I personally would just like to catch one of these people who set things up like this. I would then prove the impossible by showing that you can get a PC, plus mouse, keyboard and monitor, up someones a**e.
I have done the same, and feel the same way as GWR. If you do have a server, set up new email addresses. I can have as many as I want (within reason) for 2 squid a month. A small price to pay to keep one step ahead of these low lifes.
With regards to if I have received one from yourself. Mailwasher actually allows me to read my emails as they sit in my server pigeon hole, so if I have already recognised who has sent it, I will normally send an email to the sender to let them know what is happening.
John