Yes it is the only way to reach him. I would send another email, just because sometimes email filters can read it as spam. Another thing, sometimes he isn't around his email for a few days, so be patient.
"How a politician stands on the Second Amendment tells you how he or she views you as an individual... as a trustworthy and productive citizen, or as part of an unruly crowd that needs to be lorded, controlled, supervised, and taken care of."
--Rep. Suzanna Gratia Hupp (TX)