I don't think that this is the be-all end-all test, but I put my email address that I use for forums and the like into google and this website came up:
http://www.advancedbackgroundchecks.com/email.aspx
Apparently, my name and home address came up. I just thought some maybe interested to know if they are really anonymous or not.
I can only guess that some websites sell your personal information and websites, like the one above, buy it. Anyone who has my "anonymous" email could potentially stalk me or anyone here for that matter.