Whether you’re mailing or emailing your letter, the format is the same. Address your letter to the highest official who has responsibility for the issue you're passionate about—for example, your senator, the mayor, an executive, or a state agency director. Share your personal story and how the issue impacts you. Remember to clearly state the action you want. Close with your full name and address.
As a constituent and an MS activist, I urge you to [state specific action; for instance, "join the Congressional Multiple Sclerosis Caucus"].