Corey,
Students initially email by habit. I then email them back and tell them their question would be a great question (if pertinent to the course and not a personal question) to post on the FAQ discussion board so that everyeon may benefit from the Q & A. So, the access is still there. . .just not in your inbox. . .and others can answer the questions. By using these tips and being consistent in following these rules, students learn quickly how to get the answers they need when they need them. Now, you do have to check the FAQ and you do have to answer within 24 hours (if that's your rule) if no one else answers the questions. When students know when and how to access you, they'll be more content following the rules and you'll still be accessible, but on your terms and not 24 hours a day. Make sense? It works for me!