I can tell when people are hitting some of my posts from email accounts by checking the "visitor paths" with Statcounter. So I can see which posts people are emailing to other people. It happens sometimes.
However, some of my recent posts about my audio ripping are getting emailed around, and I have no idea why. I can't see how they would be interesting enough for anyone to bother emailing them to someone else.
But, as usual, thanks for the traffic, whoever you are.