No, they are not used to grass roots contacting them. I do it here and usually get a response but they both know I am holding them accountable. Luckily, we have two pretty good reps in the RNC. Still, you can find out who they are by calling your local state GOP office and asking. Getting their email is more difficult sometimes. My next complaint to them will be about Steele. Hey, they elected him so they are responsible for his performance.
Wikipedia seems to have done some of the work for us:
http://en.wikipedia.org/wiki/Republican_National_Committee_members