#1 - Feb. 7, 2013, 12:12 p.m.
So today my entire guild found out my email, my account name gpbg.6852 was not displayed instead my email was displayed.
Email in guild panel
#2 - Feb. 7, 2013, 12:18 p.m.
TL;DR is that this only appears to affect YOU. Other players cannot see your email address, even though you can. It’s certainly a bug, which we’re looking into.