That makes sense as the default (not sending an email on every reply to a topic you follow). I'm thinking of two scenarios: 1) email user on every reply to a post they originate, and 2) alert a moderator by email to every new topic within an identified category.

Has anyone who runs NodeBB on Heroku configured email notification? In particular, I want to let site visitors know when someone replies to their post. The daily digest is less important.

It looks like I need to add a 3rd party mail service like postmark or mandrill to the Heroku account for the site, and then add a plugin for the service. Is there anything else required, or time wasters to avoid?