I'm not certain what you are looking for. My iPhone has a "reply to" feature. It quotes the received message and allows you to answer. You also can add another recipient. What are you needing beyond that?
You misunderstood. I mean my email address wont say, say joebob@yahoo.com, it would mimic my work email address that isnt setup on the phone so when i reply to an email, it will look like it came from my work email. Pretty common in email clients.