Just to clarify. As with the old forum software it is not possible to harvest members' email addresses from here. This is due to the fact that you can't send an email direct to another member, the email goes via the user ID and the site servers. Only the recipient knows who has contacted them and it is clearly identified as originating from this site.
The only way would be if you sent an email to every member AND they replied to you direct.
I'd say check which email address and how they addressed you, then google the email address and see if it can be found on the Net and therefore by a bot.