Is exchanging emails really the same as socializing? Personally, I often find my non-Jewish friends are more tolerant and understanding of my life style then non-religious Jewish friends. Therefore, I hold that there is no reason you can’t continue your contact. And should you get together socially, I’ve never encountered any issues there either. My friends have been more then willing to come to kosher restaurants with me, and are totally respectful.
Sometimes Torah views can be masked generically. For instance, while we wouldn’t try to explain the concept of Loshon Hora, we could write that we really try hard not to gossip about others because it could hurt their feelings.