You can unsubscribe from email right in the email messages that you receive.
- In an email message from edX, go to the end of the message and click the unsubscribe link.
- In an email message from a specific course, go to the end of the message and click Modify course email settings. This will take you to your edX dashboard. Click the small gear icon and then uncheck "Receive course emails"
With some email providers like gmail, these options might not be visible in the initial message view. Instead, you might see a "[Message clipped] View entire message" link. Click this link to view the entire message, including the unsubscribe option.