I recently updated to the latest 1.5.0beta7, which this time included updating /var/discourse from git and rebuilding the container (web; separate from data). Currently, all mail is being sent from
firstname.lastname@example.org. However, the
notification email site setting is correct (and not unconfigured.discourse.org), so I’m not sure where this may be coming from? It was working correctly prior to the upgrade, but I’m not sure what container version was running at that time…
Edit; So, resetting the notification email setting to the default, and then setting and saving it again seems to have resolved this. However that’s a bit scary?