You can check for youself by holding the mouse down over the username - try both matelot and Land After as examples.
- I think that is an 'admin's function', PPT and I do not see any email addresses through that route at my level, and of course at 'user's level' they will never see one. My understanding of the PPRune 'email a user' function is that the address remains hidden by the software?
One option we have, of course, ignored is that a trojan could be sitting on the relevant user's computer and is passing the email address to all its 'friends'.