I need assistance with a task. I have a landing page with a form on it. Our sales teams directs people to this form. I want to differentiate the people who fill out this form. For example, if person A fills out the form and Person A is already an existing record in my Salesforce/Marketo instance (SFDC and Marketo have a sync) they go through Flow A and certain fields don't get updated. If person B fills out the form and person B is a new lead, not in Salesforce/Marketo, they go through flow B and certain fields are updated. My issue is how do I tell Marketo to figure out if a person who fills out the form already exists in my database or if the person is a brand new record? What filter do I need to put in my smart list in my smart campaign? Any assistance would be greatly appreciated

Can I use original source type. Records that were originally created in our Salesforce, and pushed into Marketo are stamped with "salesforce.com" as original source type. Records that come through any marketo forms are stamped with "web from fill out" as original source type. So can't I create a smart list that says the following:PERSON IS CREATED with a constraint is FORM NAME is ANYORIGINAL SOURCE TYPE = salesforce.comWouldn't this smart list show me people who filled out any form who already existed in the database and I can create my flows to be whatever I want (update certain values or not update certain values)