This is a big issue that continues to grow by the day. I used to get pissed and grill the person that mailed me on how they obtained my address but it is to the point that I realize I will never get a straight or honest answer. I just delete the mail and move on with what I was doing. These clowns are not worth my time. I do keep a file of repeat offenders just for my benefit.
What really will tick me off is the AM that goes to whois and contacts me through Domains by Proxy, that is a sure fire way to get on my bad side. I have even had programs ask me to sign up via that method without ever looking at my site. They would have seen their listing on the home page and with a bit of looking, had my email in the system.
end rant, blood pressure is rising
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"People who are unable to motivate themselves must be content with mediocrity." ~Andrew Carnegie~