Its a little concerning, but then again I'm sure your email is al over the web so its not suprising. I would ask them where they got that emailand if the don't respond I would block them. If they tell you where of course you may then correct the error. If the email was from me, you have nothing to worry about
Its like the software tech. from a social networking site that will remain nameless. After the 3rd day he did not respond to my email I left a voice mail on his home phone. He called me back real quick to say the least and asked that I not give out that number. Of course I will not but it just goes to show you how easy it is to obtain information these days. A lot of the people I find on LinkedIn I get their home number and sometimes private email without asking for it. I actually do this for their benefit so they will not get in trouble with their office.