Our mailing list is hosted at Google Groups. You can find it here:
We strongly suggest subscribing with the “All Mail” option.
If you don't have a Google Account, you can subscribe by sending an email to email@example.com.
We also have a MailChimp “announcement list” for sending out notifications about classes and whatnot to try to cover those who did not select the “All Mail” option, or others just interested in announcements. You can subscribe to that here.