An easy way to solve this would be to add categories (aka groups) to autocomplete. So when a user types "softball team" in the To, Cc, or Bcc field, it sends the message to everyone in that category.
This has been requested before. You can vote for it here:
https://portal.smartertools.com/community/a86608/easy-way-to-send-email-to-a-group.aspx