There is a very quick way to unsubscribe from our emails. Search for any Packback email that you recently received (you can just enter "@packback.co" into the "Search email" field), scroll down to the very bottom of the email and click the "unsubscribe from this list" link.
On a separate tab you will see a confirmation message saying:
You've been unsubscribed.
Your email address has been removed from our mailing list. We're sorry to see you go, but we won't be sending any more email to your address.
Keep in mind that once you unsubscribe, you won't be able to receive any of our emails, including password reset or notification on your moderated posts, which could potentially affect your participation grade. If you have any troubles with finding Packback emails, shoot us an email at email@example.com, and we will unsubscribe you from our mailing list!