I have the same problem. I've thought about sending out Christmas Cards to all the random people that have revealed to me a little too much information by not minding their email address.
A coworker convinced me to try and see what the most outlandish thing I could say and still be believed was. Some of the toppers:
1) I don't know why we need firemen. My has has never even caught fire!
2) My wife cheated on me once with a fireman and now I am getting my revenge!
3) I believe in privatizing fire service, when the need arises the market will find a solution!
I toohave received emails intended for others. One time I was included ina group email which kept going back and forth and they would not stop emailing me after asking several times. I just started replying with ridiculous answers to the questions and they finally stopped. So I don't blame you, just be careful.