According to its docu and forums, discourse can behave as a mailing list. It can be setup to:
- Enable auto subscribing to every message in a category
- Enable replies from email
- Enable starting new topics in a category by mailing a category specific email address
- Enable unregistered users to send messages to threads by e-mail
Over at OK Brasil we are reformulating our communications. We’re considering Discourse, but have agreed that without all these features enabled Discourse is mostly useless.
Any plans to enable them soon?