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Chrissy,
Sure. Since Marketo doesn't have access to the Type field in the Activity record, you have to do this through SFDC.
You can do it using structured subject lines. So make all activities that are logged from sending MSI email have something in the subject the same (i.e. "[Sales Insight] Lead was sent Sales Email: {{trigger.name}}")
You can create a SFDC workflow on the Task object to change the Type field when a record is created. Here is a screenshot of it in action:
Let me know if you have any more questions!