This seems to be an issue that repeats itself. I know this was already mentioned in other posts/questions, but we are still having the issue after checking all settings were correct.
We have an AWS node that is unmanaged, but is still alerting (no e-mails) and showing up on the main Dashboard of Solarwinds. I have verified that the setting is disabled for alerting on unmanaged nodes:

As you can see here, the node is unmanaged but we still received the alert:

Anybody else dealing with this issue?