How to handle repurposing?

I currently use Feedburner to handle my main site feed, in part because it takes care of the hassle of ensuring feed validity, providing Atom or RSS feeds and also the feed stats.

One feature on Feedburner is identifying “Uncommon Uses” or sites where the feed content appears where it usually should not.

I’ve noticed recently that some wierd porn sites keep popping up in my uncommon uses list. I have no intention of visting such NSFW sites to figure out where my site content appears on the site.

I also would like to contact the webmaster and tell them to stop doing this, but am terrified of giving away my “real” mail ID – I get enough spam as it is! Any suggestions on how to solve this problem?