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He shouldn't be able to do this. Tell them to use a Template.
But I would do some tests to see what seems to happen. If you allow a "blank" MSI email, does that still happen?
If they want to send a custom email, use their regular account.
+1 on Josh. There is a Marketo Add-In for outlook that enables a sales person to write and email in Outlook a route it in SFDC. You can issue licences for this add-in it through the MSI Panel in Marketo admin.