Select and email a custom group of customers from Customers - simply select which customers you would like to contact from the list then click Bulk actions>Email.

Email all the customers booked in to a session or course by navigating to the session on your schedule or course in the Courses tab, clicking Attendees or Customers respectively, and then Email attendees.

You can also email all the customers with a certain package by going to Packages> select the relevant package>Package customers>Email.