To prevent emails, including course information, from going to spam when sending them in bulk, you can follow these general tips:

1. Use a reputable email service provider: Using a well-known and trusted email service provider can improve the deliverability of your emails.

2. Maintain a clean email list: Ensure that your email list is up-to-date and does not contain invalid or outdated email addresses. Regularly clean your list to remove inactive or bounced email addresses.

3. Avoid spammy content: Craft your email content carefully to avoid spam triggers. Use clear and concise subject lines and avoid using excessive capitalization, special characters, or spammy words.

4. Authenticate your domain: Implement authentication methods like SPF (Sender Policy Framework) and DKIM (DomainKeys Identified Mail) to verify your domain’s legitimacy, reducing the chances of your emails being marked as spam.

5. Monitor your email sending reputation: Keep an eye on your email sending reputation using tools like SenderScore or Mailgun. A good sending reputation helps in email deliverability.

6. Use opt-in and opt-out mechanisms: Ensure that recipients have given explicit consent to receive emails from you, and provide an easy way for them to unsubscribe if they no longer wish to receive emails.

7. Test your emails: Before sending emails in bulk, perform tests to check how they appear in different email clients and ensure they are correctly formatted.

8. Segment your email list: Segment your email list based on recipient preferences and behavior to send more targeted and relevant content.

9. Monitor delivery and engagement: Keep track of email open rates, click-through rates, and bounce rates. Adjust your email strategy based on the data you collect.