Personally knowing a majority of the moderators here, and being fully aware of how this site is run, I find the notion of mods "harvesting" members' email addresses ludicrous (and frankly, insulting). I would go as far as to simply state as fact, "did not happen."

As Jose indicated, there will be no real way to track down how or why your email address has been spammed. If you like, you can always change it.

Happens to the best of us. Spam is simply a fact of life, and there's no way to fully insulate a given email address. That's why we have access to a nearly infinite supply of them for free.

Paul