I'm more interested in the definition of "received." I've sent some emails through Sales Insights and have a trigger based on "Sales Email is Received." Nothing is happening after the emails arrive in the inbox.
Jeff is correct. Any email sent with MSI is considdered a sales email. Please not MSI respects the rules. So if operational email it would send even though someone is unsubscribed. And if not it wouldn't send.
My understanding is that a Sales Email is an email that is sent via Sales Insight using templates or an email sent through Outlook and tracked using the plug-in.