Coaches shouldn't have to maintain email distribution groups. Let each player decide where communications are sent. Invite others who wish to be informed about team events and messages.
All of the team's events are managed on a schedule which can be viewed in the app, imported as an iCal feed into your personal calendar, or shared as a link with family and friends.
A poll can be sent for any event on the schedule; practice, game, or some tentative tournament in the future to the entire team requesting a response of "yes", "no", or "maybe".
Keep your team in the loop
teamloop works great for all sports and potentially many areas outside of sports. If you have any type of group that you communicate with frequently and may need to schedule regular events and poll the individuals within the group then teamloop might work for you (we use it for developing teamloop!).
Sports or groups that teamloop works well with include (but are definitely not limited to):