It is next to impossible to segment our contacts to send targeted content when our contact data is so incomplete due to contacts being auto-created. When we add contacts to our system, there are a number of required properties (eg. job function, region, industry, etc.), auto-created contacts do not have any of this information. The example above of how Salesforce does it is exactly what I envioned to be a great solution for this issue - a pop- up notifies us in the email exension whether or not the contact is in the CRM, then we have the choice on how to proceed.