There is an email list for class related annoucements.
Information may be found here
You can also read the list archives
To change your subscription status, send mail to firstname.lastname@example.org or email@example.com. If your browser is set up to send mail, you can click on the appropriate link to send the mail. A few minutes later, a confirmation email will be sent to you with instructions to complete the request. If you have trouble, send mail to firstname.lastname@example.org.