Instructors can send various types of emails to their list: 1. Welcome Emails: Introduce new subscribers to your offerings. 2. Newsletters: Share updates, news, and valuable content regularly. 3. Course Promotions: Announce new courses, special discounts, or early-bird offers. 4. Educational Content: Provide tips, tutorials, and other valuable content that can help your audience. 5. Feedback Requests: Ask for feedback to improve your courses and services.