Users can be selected for emailing in the user reports screen. This screen is accessed by going to Admin>> Reports >> User Reports. This screen (seen below) can select users based on various criteria, including club-defined dates and text fields. From the generated list of users, you can also un-select users from the list before creating your email. If for example, you would like to create a distribution list for instructors and/or owners, you can create a club-defined text field called email group and enter the appropriate text in the user profile for the users you want in the group.
For additional help on entering a club-defined text field, see the following article: