Sales Insight emails will always be considered marketing emails, and therefore cannot be sent as operational.
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Marketo emails can be marked as operational when created. I revisited this tread today and it looks like it works as long as you mark your email as operational and publish it to sales insight.
I originally asked this question because I wanted to know if this would work for our client services team if they decided to use MSI emails to send out release notes to our customers.