On one of my personal email accounts (the one that I use for junk email), I just received a email announcing the opening of a new dental clinic near my home. The email has a return address of some marketing firm. I know with certainty that I have never had any contact with this dental clinic or marketing firm. So I have to ask: how did they know my email address? Is there such a thing as sending out emails to a defined geographical area? I was chatting with my neighbors out at the mail box, and they received the same email as well.