I occasionally receive emails from recruiters and, as you would expect, they look like the kind of message that they send to all the people they are trying to recruit. I'm currently employed and happy with my job, but of course there is a price at which I would be willing to leave my current job. Of course, the initial recruitment email does not have enough information for me to determine if they are even close to my price.
How can I get more information from these recruiters in a polite manner while at the same time not showing so much interest that they'll continue to hound me or that I'll burn the bridge by making them feel like I've wasted their time?