far as i know when someone clicks on your profile link to email you it emails what account you use when you set it up in your profile not a dot org one, and the org, keeps this info private...other then that you can pm people on here
for instance if you click in my profile to email me it will send the mail to my hotmail account but u dont see my hotmail account infor, the org keeps that info private, now u can put an email add in your profile if you chose or i believe you can change your settings to make it visable, but far as i know there is no dot org mail server