I have my system set so it doesn't send any response if I receive or open an email. These are settings you can choose (I use Pegasus for much of my email). It should be the same as if I were reading my email offline.
I only was poking around in there out of curiosity. If I tell the Norton firewall software to track down a source of intended assault on my computer (the little exclamation point in the red circle is always blinking) then it goes to some pretty exotic places. Sometimes. It's just interesting, what in the world is going on out there with Internet predators, and where they operate from. I know little can be done about them, unless they truly come from the U.S. and their IP is from the U.S. and you complain. Sometimes that gets results. Now that there are so many fake addresses around it doesn't do much good to complain.