Wow, that's pretty darn cool! Glad to see something like this come to fruition for flarum that will also be offered to the community. Great job by the Blomstra team and special thanks for the client for commissioning.
We'd love to leverage something like this but would need a self-hosted option, so I am hopeful some of the other mail options make its way in at some point. Also excited to see what comes from the other integration points, namely slack