Hii i think this is not old news for Everyone Face book email is now active now u can send email thru facebook message box or via any email accounts to face book users vice versa face book users also send mails. Now enjoy with face book mailing services .. ur facebook email id look like
no need of login just login into face-book Account and send message through Message box u can send message or mail by to: message:hhiii nad chk ur mail.com vice versa using gmail:to:urfacebookusername@facebook.com