Free and open discussions.
How do I subscribe?
In each category, there are options to change your watching preferences. You should also adjust your user preferences as needed.
Select Watching to closely mimic mailing list functionality:
And make sure that an email is sent for every new post in your user preferences:
Screenshots courtesy of the Chef Project’s Discourse.
How do I unsubscribe?
To unsubscribe completely from the category, open the web interface and disable email notifications.