I thought hiding my email address when placing an add would be a good thing to protect me, but it has not worked the best.
I had three members contact me using the contact seller button, that I was not able to contact. When I would reply, it would bounce back. I'm guessing they have a old email in their profile.
I think on my next adds, I'll show my email address.
With each person that contacted me, I asked for a screen name and location, so I could check they were a MOA member. This seemed to work.