I know it kind of sounds absurd to ask. All the SO employees would be having this email address ending with stackoverflow dot com. I was just wondering if I can get this address. or does stackoverflow users get this address, may be once they cross a particular reputation mark.
Those emails are reserved for Stack Exchange employee. Moderators don't have them; they use their own personal ones, as you mostly see on moderator profiles. This will likely never change: Stack Overflow is a Q&A site, not an email provider.
Server administrators probably have enough on their hands without dealing with your email problems and trying to set up a system for tons of people.