What you do is have your mail bot send out spam with a twist. As each message is composed and sent, it contains an embedded image of a random name (in fact, it doesn't really exist) that is really a reference number.
For example <img src=http://logging.microsoft.com/verify/123451.jpg border=0 >
Your web server error log will identify every time one of those images was tried and then that gets matched automatically to your database of names.
Now you have:
1. A verified email address
2. An originating IP (can narrow down to what continent they are on or if broadband customers)
3. What OS you are running
4. Possibly what email client or web browser you use.
This is worth big bucks in the form of "email leads" sold by geographic regions and whether they are dialup, cable customers, business, etc.
.. )
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