I don't actually know. Someone posted (on the forum somewhere, overnight my time) that my email was showing on every post I made. They said they didn't know why, and neither did I. So I looked in my profile and saw that Allow users to email me was ticked, and assumed that's what showed my email addy, so I unclicked it.
If that's not what the person meant, I have no idea; and like I said, I can't find the post now.