Twitter is a very cool way of staying up to date with your favorite fighters, celebreties and so on...
You can tweet the fighters (Public message) or you can PM them (Which cannot be seen by others)... Odds of getting a reply are not always that good though.
Still - I'd say Twitter is the way to go since most fighters don't have official mail-boxes or whatever. All that kinda stuff goes through their managers.
PM Inter - he's dealt with a few fighters, maybe he has a few useful tips for you. He probably can't hand out email adresses though