Post course message with bbml supportBLACKBOARD_CREATE_MESSAGE
Creates a new message within a specific Blackboard course. This endpoint allows users to compose and send messages to course participants, supporting rich text formatting through BbML, file attachments, and flexible recipient management. It's ideal for course announcements, discussions, or direct communication between instructors and students. The endpoint should be used when there's a need to initiate or continue a conversation within the context of a particular course. It provides comprehensive options for message creation, including subject, body content with rich formatting, recipient lists (To, CC, BCC), and file attachments. However, it does not support scheduling messages for future delivery or sending to recipients outside the course context.